Best saltwater fish for 100 gallon tank

Best saltwater fish for 100 gallon tank

Saltwater fish for 100 gallons tank, both large and small, are the undoubted decoration of the reservoir due to their brightness, color saturation, and exotic appearance. Despite the fact that in nature there are a considerable number of varieties of these fish, not all can be settled in an aquarium and not everyone will be able to live and feel well in captivity. This article will provide a brief overview of the saltwater aquarium fish that are most suitable for keeping in home 100 gallon tank seawater.

Fish for small aquariums

The main problems with small containers are:

  • firstly, the compatibility of fish, when it is necessary to take into account not only their size, but also the level of aggression, mobility, etc.
  • secondly, the difficulty in providing effective filtration in a small volume and daily feeding of fish accelerates the growth of algae, and this is an additional concern for cleaning, preventing diseases, etc.

Therefore, the population of such reservoirs must be carefully thought out in advance. It is better to give preference to calm fish no more than 4-5 cm long.

Fish for large aquariums of 100 gallons

It is easier to remove organic matter and fish waste (meaning containers from 250-300 liters). They can be settled in flocks. When selecting, the main attention should be paid to the size and mobility of the fish. It is important to first study their features:

  • are they not poisonous,
  • are they not predatory,
  • do they eat corals
  • etc.

In any case, the purchase should not be spontaneous, because these fish are quite expensive. Moreover, now you can find information either on your own or seek advice from a specialist.

Marine aquarium fish

Parrot fish or Bleeker’s chlorurus (Latin Chlorurus bleekeri, English Bleeker’s parrotfish)

It was named so because of the great similarity of the mouth apparatus to the beak of birds. The mouth in parrotfish is a rigid bony plate that helps the animal to nibble on corals.

Parrot fish or Bleeker's chlorurus (Latin Chlorurus bleekeri, English Bleeker’s parrotfish)

Shades and intensity of coloration can vary from individual to individual, but it is generally green with blue, purple, and pink touches. Males are much brighter than females.

The main food of this creature is small invertebrates and algae living in corals. To get them, the fish with its powerful jaws plucks off a piece of the reef, crushes it to the state of sand, eats invertebrates, and spits out the fragments of their shells.

Chlorurus reaches quite impressive sizes – up to half a meter, and requires large volumes of the aquarium so even your 100 gallon tank won’t be enough – over a ton. In cramped containers, it shows aggression towards other fish, therefore, it is rarely found in home aquariums, mostly it is brought up in public aquariums.

Steephead Parrotfish, Chlorurus microrhinos

In captivity, parrot fish can be fed with mussel meat, shrimp, chopped squid, seaweed. It is imperative to have corals, from which the Chlorurus will grind down its continuously growing beak.

Blue surgeon (Latin Paracanthurus hepatus, English Regal Tang)

Blue surgeon (Latin Paracanthurus hepatus, English Regal Tang)

In total, the family of surgeons (Latin Acanthuridae) has over 80 vivid species, but the blue surgeon is the most popular. This fish lives in corals. It feeds on algae, plankton and detritus. Its main feature is a small retractable sharp plate near the caudal fin, similar to a scalpel. When the enemy attacks, the fish directs it towards the offender and thus defends itself.

The popularity of this fish is due to its extremely peaceful dispositionthe blue surgeon does not spoil the corals and does not create disorder in the house reef, does not dig through the soil, and does not pursue other inhabitants.

Even against the backdrop of vibrant marine fish, the blue surgeon is distinguished by its rich sapphire blue color and yellow caudal fin. There is a noticeable black pattern on the dorsum, edges of fins, and operculum. In captivity, they grow up to 15 cm, and is one of the best saltwater fish for 100 gallon tank.

Blue Surgeon Fishes In Love With GoPro

The surgeon has an excellent appetite and gladly eats all food intended for marine life. But still, most of the food should consist of plant components. With deficiencies in vegetation in the diet, fish begin to pluck reefs.

Clown Triggerfish (Latin Balistoides conspicillum, English Clown Triggerfish)

Very beautiful, very rare and very expensive. If you create recommended conditions for this fish, it will live for a long time.

Clown Triggerfish (Latin Balistoides conspicillum, English Clown Triggerfish)

But it must be remembered that he is very aggressive and is capable of not only ruining fish but also thoroughly spoiling corals and even communications in the aquarium.

It is recommended to keep one individual in an aquarium with a volume of 100 gallons or more. Neighbors should not be smaller than him in size. They usually feed meat of squid, mussels, crabs, and shrimps.

Large clown triggerfish & undulated triggerfish

The fish looks very bright – the upper part of the body has a black solid color, but the abdomen is decorated with round white contrasting spots. On the back, there is a vague yellow spot. The mouth has a yellow border, giving the triggerfish a clown-like appearance.

Flame angelfish (Latin Centropyge loricula, English Flame Angelfish)

Flame angelfish (Latin Centropyge loricula, English Flame Angelfish)

Has an unparalleled vibrant color and is the undisputed king of reef aquariums. Peacefully neighbors with other non-aggressive fish.

The diet consists of both plant foods and invertebrates (live or frozen).

Flame Angel & Yellow Tangs Saltwater fish @ LFS.

There is a nuance: they are very moody and demanding on the quality of water.

Moorish idol (Latin Zanclus cornutus, English Moorish idol)

Moorish idol (Latin Zanclus cornutus, English Moorish idol)

Another very popular fish in saltwater tank. The Moorish idol is very beautiful, but terribly picky about the conditions of detention. Only people with colossal experience in this matter will be able to take care of it. But even under ideal conditions, it does not live for more than five years.

The idol’s body is tall, and due to its long dorsal and anal fin it has a semi-moon shape. The snout is thin, elongated. Coloring is three black stripes alternating on a white-yellow background.

DayDream Safari Palau: Moorish Idol

It can coexist well with angels and surgeon fish. From food you can give sponges, bryozoans, sessile invertebrates. Frozen food is perfectly acceptable.

Lion scorpionfish (Latin Dendrochirus zebra, English Lion fish).

Lion scorpionfish (Latin Dendrochirus zebra, English Lion fish).

This is a predatory fish, but it gets along well with large, non-aggressive neighbors. The content is quite undemanding. They are fed with small fish, but can also eat non-living food.

It must be handled with care since it is the owner of poisonous thorns, the prick of which is quite painful.

Lionfish & Scorpionfish Feeding Frenzy

The lion scorpion has an interesting coloration and behavior. Its fins are lush, long, and their hard rays are transformed into thick, poisonous spines. The color can range from striped orange to gray. In an aquarium, her grace is able to attract attention for a long time.

Mandarin fish (Latin Synchiropus splendidus, English Mandarin fish)

Mandarin fish (Latin Synchiropus splendidus, English Mandarin fish)

On this fish, nature has applied all its wild imagination, so its colors are original. It is difficult to adapt to the conditions of the aquarium due to specific dietary habits. If the fish successfully took root and began to eat frozen food, then we can assume that the aquascaper has received a beautiful and hardy aquarium inhabitant who is not susceptible to such a common disease as Ichthyophthirius. The fact is that mandarines have a special type of skin on which parasitic ciliates cannot live.

These small fish grow about 15 cm in length. Good choice of saltwater fish for 100 gallon tank. They eat small invertebrates. The background color of the mandarinfish is orange with a maze of turquoise patterns and a blue border on the fins.

Zebrasoma (lat.Zebrasoma)

Zebrasoma (lat.Zebrasoma)

A genus of the family of surgical fish, consisting of seven species. These are the owners of a very original appearance: her best quality is elongated as if the fish is constantly surprised at something.

The main character trait is curiosity. Representatives of the genus are constantly exploring something.

It can be kept in small groups, but taking into account the fact that it is best to keep this saltwater fish in 100 gallon tank.

They feed mainly on algae, so plant foods should form the basis of the diet. You can also diversify your diet by adding protein foods of animal origin, for this they use brine shrimp, mussel, squid, and shrimp meat.

🐟 Morskie Zebrasoma żółta & Pokolec królewski🐟

It is better to maintain the water temperature at the level of 25-28 degrees and replace water every two weeks with 20 percent fresh, but with the same parameters.

Clownfish (Latin Amphiprion)

The genus of marine clownfish has about thirty species. It is distinguished by its bright appearance and kind disposition, but with an insufficient number of shelters in the aquarium, it can show signs of aggression. Can be easily propagated in captivity, which is rare for saltwater fish.

Clownfish (Latin Amphiprion)

In nature, it is absolutely not afraid of enemies, as it favorably neighbors with poisonous sea anemones, to the poison of which it is immune. Moreover, it is not congenital, but acquired: for a long time and patiently, the fish touch the anemones with their bodies, often getting burns.

The result of this behavior is the production of skin mucus, which makes the clown invisible to toxic neighbors. There are many varieties, including brown-white and tomato clownfish.

All fry are initially males, and with age, they are able to change sex.

Blacktip reef shark (Latin Carcharhinus melanopterus, English Blacktip reef shark)

Blacktip reef shark (Latin Carcharhinus melanopterus, English Blacktip reef shark)

This is a cherished but difficult dream of marine aquarists. The minimum vessel volume for such a fish is 500 gallons. Obviously, not everyone can afford such a luxury. But watching your own domestic shark is certainly amazing.

These sharks are relatively small in size – up to 1.5 m, and therefore are successfully kept in aquariums. In order for the animal not to experience problems with turns, it is desirable to keep it in a container in the form of a sphere or cylinder. Also, the decorations should take up as little space as possible and not have sharp corners about which a nervous shark can easily get hurt.


Reef sharks are fed with seafood – live and frozen fish, squid, crustaceans.

Chrysiptera (lat.Chrysiptera)

Chrysiptera (lat.Chrysiptera)

Sapphire Chrysiptera Cyanea and yellow-tailed Chrysiptera Parasema. Small fish. Their eyes are large and expressive.

Sapphire is a completely bright blue hue, and yellow-tailed, respectively, has a blue body and a yellow tail. Species are hostile to their own kind.

Chrysiptera hemicyanea

You can, of course, risk keeping them in a flock, but the aquarium should be spacious, and it’s better to start young animals of the same age.

Royal gramma (lat.Gramma loreto, eng.Royal gramma)

Royal gramma (lat.Gramma loreto, eng.Royal gramma)

The appearance of this bright and miniature fish is very deceiving. In fact, she is very tough on her territory, especially if she is kept in cramped aquariums. Royal gramma prefers to occupy shelters and protect them, threateningly showing its wide mouth to all ill-wishers. It feeds on the bottom, and as for food it can be given the meat of mussels, crustaceans, squid.

Royal Gramma - Blennie Attack

The color of the royal gramma is bright and attracts attention – the front part is painted in a rich crimson color, which smoothly turns into a canary yellow tail.

Anthias (Latin Anthiidae)

It is a very large family with about 200 species. All fish are colorful, live in flocks. The ideal option for a small aquarium with live corals is Plectranthias inermis (Latin Plectranthias inermis, English Red blotched perchlet) – small (about 4.5 cm), peaceful.

Fathead Sunburst Anthias(new comer in my tank)

The main condition for his long and happy life is a sufficient number of shelters.

Copperband butterflyfish (Latin Chelmon Rostratus, English Copperband Butterflyfish)

Copperband butterflyfish (Latin Chelmon Rostratus, English Copperband Butterflyfish)

It has an unusual elongated stigma similar to tweezers. With its help, the fish pulls out worms and small invertebrates from narrow crevices.

It is very difficult to accustom butterflyfish to frozen food, so when buying a fish, make sure that it is pre-fed. In the aquarium, it can be fed with brine shrimp, finely chopped sea fish, shrimp, and squid.

The aquarium for these creatures should contain a large number of live stones, and also be spacious enough – 100 gallons for one fish. A moderately territorial species showing aggression towards other representatives of the butterflyfish family, therefore it is better not to keep them in a species aquarium. In relation to other species, on the contrary, a very phlegmatic butterfly can suffer from an overly vicious and obsessive neighbor.

5 Minutes of Looking at My Copperband Butterfly, Why Not!!! 😁

The butterflyfish is not only a beautiful aquarium inhabitant, but also very useful. It is believed to be the most effective remedy against Aiptasia (glass roses).

Emperor angelfish (Latin Pomacanthus Imperator, English Emperor Angelfish)

Emperor angelfish (Latin Pomacanthus Imperator, English Emperor Angelfish)

Its striking looks and ease of maintenance make it a favorite in saltwater aquariums.

In a large aquarium with good filtration and maintenance, this large fish can live up to 15 years. Requires quality feed.

The emperor angelfish can be aggressive towards other fish, so it is best to keep this saltwater fish in 100 gallon tank with a lot of shelters. Neighbors must be proportionate.

Pomacanthus imperator - Emperor angelfish

Perhaps the only drawback is that large angels can harm sedentary invertebrates and small aquarium inhabitants.

Red stripe angelfish (Latin Centropyge eibli, English Blacktail Angelfish)

Kind disposition and bright colors made this fish one of the best saltwater fish for 100 gallon tank. Its length usually does not exceed 11 cm.

20老虎新娘(虎紋仙 香港)Centropyge eibli(Blacktail angelfish)20130502

Able to live in a smaller aquariums, adaptation to new conditions is quite easy and painless.

The main food is algae, small worms, invertebrates, and crustaceans. Most of the diet should be plant foods. An interesting feature of this species is that the largest individual of the flock becomes a male.

Pyjama Wrasse (Latin Pseudocheilinus hexataenia, English Sixline Wrasse)

Thanks to its original color, it is a living decoration of the marine aquarium. However, it is not easy for him to fit into the reef community. He is very territorial and aggressive towards other inhabitants.

6-Line Wrasse (Up-Close)

The lifestyle is diurnal. At night he hides in grottoes or buries himself in the sand. The main requirements for the organization of conditions are a water temperature of 22-26 degrees and the presence of shelters.

They are fed with frozen and herbal supplements. The benefits of the wrasse are enormous: it destroys parasites in the aquarium.

Comet (Latin Calloplesiops altivelis, English Marine betta)

In terms of body shape, this fish resembles the very common inhabitants of freshwater aquariums – siamese fighting fish. But this similarity is deceptive, apart from the appearance there is nothing related between them.

A large number of shelters and the presence of shaded areas in the aquarium are a must for this pet.

His lifestyle is twilight. Doesn’t like bright light.

If there is not enough shelter, then it will become nervous, fearful, and this feature cannot be corrected later.

Especially carefully you need to approach the selection of neighbors for living together. They must be peaceful, otherwise, the marine betta will hide a lot and eventually die from exhaustion and stress. Small fish, on the other hand, will quickly be eaten by a comet.

You can feed this inhabitant with small fish, thinly sliced ​​fillets of sea fish, shrimp, and squid. Learns well to live on freshwater fish food.

Thalassoma lunar (Latin Thalassoma lunare, English Moon Wrasse)

Thalassoma lunar (Latin Thalassoma lunare, English Moon Wrasse)

In youth, these fish are gray and inconspicuous, but as they grow up, they turn into beautiful wondrous creatures, just like ugly ducklings.

It is best to keep this saltwater fish in at least 100 gallon tank with plenty of room to swim. Predatory fish, they will destroy all small fish. The behavior is quite aggressive: they oppress not only those who are smaller, but also those who are similar to them in appearance. In case of danger, they can hide among the stones.

オトメベラ Moon Wrasse Thalassoma lunare

The diet should be based on animal feed. Kriel, mussels, crustaceans, fillets of marine fish are used for feeding too.

Conclusion on best saltwater fish for 100 gallon tank

Of course, not all fish for a marine aquarium are listed here, but only the most common ones.

Let’s say that saltwater fish are quite expensive – this is not a very pleasant fact. And without investing time, effort, and knowledge, they can be quickly ruined. And picking marine fish for an aquarium is not easy.

The combination of colors, shapes, compatibility, planting density, demanding conditions – this is not a complete list of what needs to be foreseen. Therefore, it is better to choose small, peaceful, and as unpretentious as possible individuals. They are cheaper, less contaminated, and less likely to invisibly carry infections and parasites. Go for it!