Should I buy it?
Firemouth Cichlid
Thorichthys meeki
Calmer than most Central American cichlids. Bluffs hard with the red throat but rarely follows through unless spawning.
Firemouth Cichlid tank mates · 200L tank size hub
semi-aggressive · intermediate care
Sources & confidencehigh · partially verified · beginner: caution
Checked against several solid care sources that mostly agree. Numbers here are a careful starting point. Your tap water, tank size, and habits decide the rest. How we evaluate.
Best for: Community tanks of 200 L or more with similarly sized robust tank-mates.
Avoid if: Your tank is under 150L, or you keep delicate small tetras and shrimp.
Common mistakeBuying one firemouth alone is how keepers invent a more aggressive, skittish fish than a bonded pair would be. Get two and let them choose each other in two-hundred-litre class water. Solo display fish look dramatic and then own every corner without a partner to settle the social math.
Top things that go wrong
- Grows large or needs a very big footprint. Firemouth Cichlid is often sold at sizes that hide adult length (~12cm) and a published minimum near **200L**. Shop tanks are not adult housing.
- Mouth gap vs tiny tank mates. May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
- Shrimp & snails. Not shrimp-safe — adults, fry, or both get eaten.
What most shops don't tell you
- 1.Myth: a single firemouth stays a peaceful community centrepiece because most of its aggression is only bluff display. Reality: solos get skittish and territorial, and spawning pairs still need space — plan a bonded pair in honest footprint, not one fish forever beside neons.
- 2.Predation risk scales with gape, night feeding, and crowding. 'they grew up together' is a schedule, not a law.
- 3.Buying for juvenile size in the shop tank. Budget for adult length and turning radius, not the inch-long fish in the bag.
- 4.Adding bite-sized tetras or livebearers "until the predator grows". The first lost fish lands months earlier than the plan said.
- 5.Plan for pairs/groups with rockwork; avoid tiny tetras as long-term mates once adults are established.
About this species
Central American cichlid that flares a red throat in threat. 10 to 13 cm adult. Less of a handful than large predators, but territorial when breeding and will eat bite-sized fish.
- African Cichlid200L min · same group, comparable tank size
- Convict cichlid200L min · same group, comparable tank size
- Discus200L min · same group, comparable tank size
- Jack Dempsey200L min · same group, comparable tank size
- Keyhole cichlid200L min · same group, comparable tank size
- Rainbow cichlid200L min · same group, comparable tank size
- Angelfish150L min · same fish family
- Electric Blue Acara150L min · same fish family
- Angelfishalso intermediate semi-aggressive, similar tank size
- Apistogramma Macmasterialso intermediate semi-aggressive, similar tank size
- Banded leporinusalso intermediate semi-aggressive, similar tank size
- Cockatoo / crested Apistogrammaalso intermediate semi-aggressive, similar tank size
- Electric Blue Acaraalso intermediate semi-aggressive, similar tank size
- Opaline gouramialso intermediate semi-aggressive, similar tank size
No reverse lookups listed yet.
Plan grid
Key limits are above. Here: pH band, swim level, bioload, and activity.
Swim zones
Care snapshot
Quick compare before you buy. Not a score of how “good” the fish is.
- Beginner ease32
- Peacefulness30
- Community fit19
- Small-tank fit90
- Hardiness54
- Energy54
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Example setups
Starting points only. Run the pair checker for every fish you add.
Avoid “one of everything” baskets — Firemouth Cichlid belongs in a plan built around territory, line-of-sight breaks, and matched water chemistry.
Compatibility
Tank mates for Firemouth Cichlid
Usually safer (engine GOOD): Electric Blue Acara, Swordtail. Conditional (CAUTION — read the pair page before buying): Guppy, Molly, Neon Tetra, Sailfin Molly. Avoid (RISKY): Betta, Chili Rasbora. Every name links to a live pair check — the lists are a shortlist, not a stocking plan.
Usually safer
Open a pair page with this fish as the starting point.
Needs planning
Read the blocking rule on each pair page before experimenting.
Usually avoid
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Firemouth Cichlid + Electric Blue Acara
Behaviour and temperament
Firemouth cichlids are semi-aggressive. Bluff threat displays are common, with real attacks rising at spawn. They stay calmer as bonded pairs with sand and broken sight lines. Stress and corner wars explode when a lonely adult shares a short community with soft-bodied fish.
What sets them off
- Crowding and limited territory
- Similar-looking fish in the same tank
- Spawning, for any breeding pair
Fin nipping: Not a habitual fin-nipper; stressed or crowded individuals can still test fins.
Predation: May eat tank mates small enough to fit the adult mouth — plan adult sizes, not shop sizes.
Territory: Holds a patch (cave, corner, or surface). Break sight lines so neighbours can pass.
Planted tanks: good — easy plant ideas
In the glass: typical and warning signs
- A bonded pair digs sand and flares gill covers in hardish open water.
- Bluff displays toward glass and neighbours are normal ownership before true spawn defence.
- Nonstop corner ownership by a solo fish usually means social stocking failed.
- Torn dither after spawn means neighbour choice and footprint failed together.
- Spawning pairs defend a pit and may harass soft-bodied community fish.
- Solos often look meaner and more skittish than a settled pair.
- Add a compatible partner or rehome before the solo owns the whole tank.
- Move delicate tetras out if spawn defence will not settle.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Water, food, and grouping
Hardness
medium-hard
Diet
omnivore
Firemouth cichlids are omnivores that take quality cichlid pellets, frozen foods, and occasional veg in a hardish Central American layout. Overfeeding a displaying pair fouls water faster than their bluff reputation suggests. Offer what they finish, keep open sand for digging, and expect more theatre than constant bloodshed until spawn time arrives.
Shrimp & snails
Not shrimp-safe — adults, fry, or both get eaten.
Keep at least 6, bought at the same time.
- Hold 22 to 30 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 6.5 to 8 and a hardness you can re-test in two weeks. A one-time strip in the shop car park is not a water test.
- Footprint: short wide tanks and tall narrow tanks fish differently for the same volume. Match the tank shape to the swim pattern, not just the litre count.
- Tank volume meets or exceeds 200L published minimum for adults.
- You can stock at least 6 individuals (group welfare).
- Heater can hold 22–30°C without cooking cooler-water tank mates.
- No tank mates small enough to fit the adult mouth gap for this species.
Explore and stocking hubs
Tank-mates hub, matching guides, category peers, and litre stocking lists around this species’ minimum tank.
Plan with tools
Check mates as pairs first, then add this fish in the tank builder for the full stocking.
Filtration & heating
A 200L minimum tank needs a filter rated for at least 800L/hr turnover and a heater to hold 22–30°C reliably.
Plant suggestions
Firemouth Cichlid does well in planted tanks. Plants compatible with 22–30°C and pH 6.5–8:
Research: partially verified · Confidence: high · 3 linked source(s). We do not invent citations.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Thorichthys meeki
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Thorichthys meeki
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Thorichthys meeki
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
Evidence notes
- The Seriously Fish profile for the binomial in this record was successfully reached as the primary aquarium reference.
- FishBase contributes natural-range size and habitat context. Translate those numbers through your heater, your water report, and your tank footprint before stocking.
- Wikipedia is only cited if the article URL returned OK. Use it for orientation, not as the only care sheet for an import.
- All compatibility text reflects typical hobby experience and the Fishori model. Individual fish, shop stress, and the order tank mates are added in can still defy a single-paragraph label.
Featured compatibility checks
Curated pair pages for Firemouth Cichlid. Each opens a full verdict — not just a list label.
Common questions about Firemouth Cichlid
- How big do Firemouth Cichlid get?
- 13 to 15 cm. Body length is manageable; the threat displays make them look bigger.
- What size tank does Firemouth Cichlid need?
- 200 L minimum for one. 300 L for a pair with companions.
- Are Firemouth Cichlid aggressive?
- Firemouth cichlids are semi-aggressive. Bluff threat displays are common, with real attacks rising at spawn. They stay calmer as bonded pairs with sand and broken sight lines. Stress and corner wars explode when a lonely adult shares a short community with soft-bodied fish.
- What is the most common mistake with Firemouth Cichlid?
- Buying one firemouth alone is how keepers invent a more aggressive, skittish fish than a bonded pair would be. Get two and let them choose each other in two-hundred-litre class water. Solo display fish look dramatic and then own every corner without a partner to settle the social math.
- What fish can live with Firemouth Cichlid?
- The Firemouth Cichlid profile lists Electric Blue Acara, Swordtail among its safer pairings (engine-checked GOOD). Guppy, Molly, Neon Tetra, Sailfin Molly are conditional (CAUTION): workable only with the specific conditions on each pair page. Avoid Betta, Chili Rasbora (RISKY). Run the pair checker for your exact water and tank size before stocking.