Firemouth cichlid tank mates

Firemouth cichlid: semi-aggressive, 4.7 in, kept in groups of 2 or more, swims in the bottom and middle of the tank and needs about 34 gallons. It eats fish that fit in its mouth. The list below checks every species in our catalog against it.

Each species is checked against firemouth cichlids both ways: mouth size, fin nipping, temperament, territory, water overlap and keeper reports.

Good tank mates

Betta
Betta splendens
Fits
The Siamese fighting fish: one male per tank, warm still water, and no long-finned or nippy tank mates.
2.8 in · 11+ gal · 72–86°F · pH 6–7.5
Angelfish
Pterophyllum scalare
Fits
Tall, graceful cichlids for tall tanks of 30 gallons and up; adults eat neon tetras and shrimp, so stock around them.
3.5 in · 32+ gal · 77–84°F · pH 6–7
Blood parrot cichlid
hybrid
Fits
A man-made hybrid cichlid with a round body and a beak-like mouth that barely closes; usually gentle and rarely able to swallow tank mates.
7.9 in · 36+ gal · 72–82°F · pH 6.5–8
Bristlenose pleco
Ancistrus cf. cirrhosus
Fits
The go-to glass cleaner: a compact 5-inch pleco with bushy whiskers on the males that needs a cave and vegetables, not just algae.
4.9 in · 17+ gal · 70–79°F · pH 5.5–7.5
Bronze cory
Corydoras aeneus
Fits
The most widely kept cory: a tough bronze-green or albino catfish that shoals along the bottom and handles a broad range of water.
3 in · 23+ gal · 70–81°F · pH 6–8
Clown loach
Chromobotia macracanthus
Fits
A bold orange-and-black loach that lives 20 years and grows over a foot long, so a proper group needs a 6-foot tank.
15.7 in · 202+ gal · 75–86°F · pH 5–7
Common pleco
Pterygoplichthys pardalis
Fits
The classic store 'algae eater' that grows to nearly two feet, fouls the water and eats less algae with age; a fish for very large tanks only.
22.8 in · 203+ gal · 77–82°F · pH 7–7.5
Discus
Symphysodon aequifasciatus (species complex)
Fits
The 'king of the aquarium': a disc-shaped Amazon cichlid in countless bred colours that needs warm, soft, very clean water.
5.5 in · 80+ gal · 79–86°F · pH 5–7
Leopard sailfin pleco
Pterygoplichthys gibbiceps
Fits
A tall-finned pleco with a brocade pattern that is sold at 2 inches and grows to about 20, needing a very large tank and heavy filtration.
19.7 in · 187+ gal · 77–86°F · pH 5–7
Pearl gourami
Trichopodus leerii
Fits
One of the calmest and most beautiful gouramis, covered in pearly spots; ideal for a quiet planted tank with floating plants.
4.7 in · 26+ gal · 75–86°F · pH 5.5–8
Peppered cory
Corydoras paleatus
Fits
One of the hardiest corys: a mottled catfish that sifts sand in a group of six and prefers slightly cooler water.
2.8 in · 22+ gal · 72–79°F · pH 6–7
Rosy barb
Pethia conchonius
Fits
A large, hardy barb whose males turn bright pink-red when breeding; suits cooler tanks that run without a heater.
3.9 in · 28+ gal · 64–72°F · pH 6–8
Severum
Heros severus / Heros efasciatus
Fits
A calm, large South American cichlid often kept with angelfish and catfish; eats soft plants and any fish that fits in its mouth.
7.9 in · 76+ gal · 72–84°F · pH 5.5–6.5
Siamese algae eater
Crossocheilus oblongus
Fits
A slim silver fish with a black stripe and one of the few that eats black beard algae; grows to about 6 inches and loves to jump.
5.9 in · 95+ gal · 75–79°F · pH 6.5–8
Swordtail
Xiphophorus hellerii
Fits
A large, very active livebearer whose males carry a sword-shaped tail; it needs a long tank, a lid and hard water.
6.3 in · 34+ gal · 72–82°F · pH 7–8
Three spot gourami
Trichopodus trichopterus
Fits
The most common gourami: hardy, omnivorous and an air breather, though males can turn quarrelsome, especially when spawning.
5.9 in · 26+ gal · 75–86°F · pH 6–8
Assassin snail
Anentome helena
Fits
A yellow-and-brown striped predatory snail kept to control bladder, ramshorn and trumpet snails; it breeds slowly and never becomes a pest.
1 in · 3+ gal · 70–81°F · pH 7.2–8
Bladder snail
Physella acuta
Fits
A small left-coiled snail that usually hitchhikes in on plants; a self-fertilising hermaphrodite, so a single one starts a colony.
0.6 in · 1+ gal · 63–84°F · pH 7–8
Malaysian trumpet snail
Melanoides tuberculata
Fits
A cone-shelled snail that lives in the substrate and stirs it; it breeds without a mate and gives birth to live young, so it fills a tank fast.
1 in · 2+ gal · 64–77°F · pH 7–8.5
Mystery snail
Pomacea diffusa
Fits
The most popular large aquarium snail; it leaves healthy plants alone and lays its eggs above the waterline, so numbers are easy to control.
2.2 in · 7+ gal · 68–82°F · pH 7–8
Ramshorn snail
Planorbarius corneus
Fits
The classic flat-coiled snail every fishkeeper knows; it cleans up film and leftovers, breeds easily, and the red form is especially popular.
1.4 in · 4+ gal · 70–81°F · pH 7–8
Red swamp crayfish
Procambarus clarkii
Fits
A hardy but aggressive American crayfish that digs burrows, wrecks plants and eats snails and fish; invasive in many countries and banned in the EU.
3.9 in · 25+ gal · 68–79°F · pH 7–8.5
Redclaw crayfish
Cherax quadricarinatus
Fits
A large blue-green crayfish with red patches on the claws, up to 8 inches; a predator and plant shredder best kept alone under a tight lid.
7.9 in · 47+ gal · 64–82°F · pH 7.2–8.2
Bamboo shrimp
Atyopsis moluccensis
Fits
A large, fully peaceful shrimp that catches floating food with fans on its front legs; it needs strong flow and a mature tank or it starves.
3.1 in · 17+ gal · 73–82°F · pH 6.5–7.5

And 21 more in the species catalog.

Risky

And 34 more in the species catalog.

Avoid

And 46 more in the species catalog.

Every tank is different. Set yours up once (size, water, who already lives there) and each species is checked against it.

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