A handsome, pearl-grey Central American cichlid with a brilliant red throat and belly. Males flare their crimson 'firemouth' and gill covers in bluffing displays, making this one of the most characterful yet manageable medium cichlids for the hobby.
ℹ️
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Around 5-6 in (13-15 cm); males slightly larger than females.
Lifespan
8–12 years
Social needs
pair
Native region
Central America (Yucatán Peninsula of Mexico, Belize, and Guatemala)
Origin
New World
Climate
🌴 Tropical
Water type
💧 Freshwater
Family
Cichlidae
Genus
Thorichthys
Part of the Cichlids
Cichlids are a large, behaviorally complex family of freshwater fish prized for color, intelligence, and elaborate parental care. They range from peaceful dwarfs to highly territorial Rift Lake and Central American species, and most demand stable water chemistry and thoughtful tankmate selection.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Pair tank
40 gal / 151 L long
Thorichthys meeki reaches 5–6 in. 40-gal long for a bonded pair, with sand, flat stones for spawning, driftwood, peaceful tankmates, and warm 24–28 °C water.
Recommended
Central American community
55 gal / 208 L long
55-gal long Central American community with a firemouth pair plus peaceful tankmates, sand, rockwork, and gentle flow. Excellent parental display and bold red throat colour.
Tylwyth Eldar / CC BY-SA 4.0 (Wikimedia Commons)
Ideal
Central American biotope
75 gal+ / 284 L+ biotope
Central American biotope with sand, rockwork, driftwood, and a pair plus compatible tankmates. Striking red throat displays during territory defence.
H. Zell / CC BY-SA 3.0 (Wikimedia Commons)
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Egg
Fish eggs are small, translucent spheres, often laid in clutches on plants, substrate, or in a nest — or carried/brooded by a parent in livebearing and mouth-brooding species. A dark eye spot and the curled embryo become visible inside as development progresses.
Photo coming soon
Fry
Newly hatched fry are tiny and semi-transparent, frequently still carrying a yolk sac that fuels them before they feed freely. They lack full fin structure and adult coloration, staying near cover until they can swim and forage on their own.
Photo coming soon
Juvenile
Juveniles look like miniature adults but with developing fins and muted or different markings; many species shift pattern and color as they mature. Growth is rapid at this stage given clean water and steady feeding.
Adult
Adults show the species' full size, finnage, and mature coloration, and are sexually mature. Many fish develop sex-specific differences in size, color, or fin shape, which can intensify during breeding.
Color & pattern variants
Natural variants occur in the wild; selectively bred (man-made) variants were developed in captivity.
A pair needs a minimum of 30 gallons (about 110 L), with 40+ gallons preferred for tankmates. Keep temperatures at 75-86°F (24-30°C), pH 6.5-8.0, and soft to moderately hard water; they tolerate a broad range but appreciate cleanliness and stability.
Provide caves, rocks, driftwood, and some open swimming space. Moderate flow and standard lighting suit them; a sand substrate with a few hardy plants and dither fish helps them feel secure and reduces shyness.
Substrate
Use fine sand, which lets them sift mouthfuls of substrate to forage as they do in nature and is gentler on their gill covers. A few smooth flat stones provide spawning surfaces; secure any rockwork on the base glass.
Equipment & setup
A good canister or hang-on-back filter keeps nitrates down, which this genus appreciates. A standard heater and ordinary aquarium lighting complete the setup. Gentle to moderate flow is ideal; nothing specialized is required.
Diet
Firemouths are omnivores. Feed a varied diet of quality cichlid pellets and flakes plus regular frozen or live foods such as bloodworms, brine shrimp, and daphnia, with occasional vegetable matter to round things out.
Feed small amounts once or twice daily. They forage by sifting substrate, so a sand bed lets them feed naturally and stay active.
Behavior & temperament
Relatively peaceful for a cichlid outside of breeding, relying on bluff displays — flared red throat and gill covers — more than outright violence. Becomes territorial and defensive when spawning. Works in larger community tanks with robust, similarly sized tankmates such as other Central American cichlids, larger tetras, and catfish.
They are substrate-spawners and excellent, attentive parents. Their characteristic threat displays are part of their charm rather than a sign of true aggression.
Health
Hardy and beginner-friendly when water is well maintained. Susceptible to ich and, like many Central American cichlids, to hole-in-the-head if water quality slips or diet is poor. The genus Thorichthys is somewhat sensitive to dissolved waste, so keep nitrates low with regular water changes.
Tips, DIY & hacks
Keep a few dither fish (peaceful midwater swimmers) to draw firemouths out and reduce skittishness. To get a pair, grow out a group of six and let a bond form naturally. Their red coloration intensifies with a varied, carotenoid-rich diet and clean, warm water.
