Should I buy it?
Platy
Xiphophorus maculatus
Also known as: moonfish (old trade), Moonfish (old trade)
Fishori provides conservative planning guidance, not guarantees.
Based on multiple reputable aquarium care sources with strong agreement. Use the numbers here as planning defaults — your room, water, and routine still shape real-world outcomes.
Forgiving in hard tap water and slower to overbreed than guppies. Fry are tougher and parents less likely to pursue them.
Best for
Beginner hard-water community tanks 60L+ that want livebearer colour without guppy-pace breeding.
Avoid if
Your water is soft and acidic. You want a single fish. You cannot rehome the occasional fry batch.
Top things that go wrong
- Shrimp & snails. Shrimp: compatible in most setups. Cherry shrimp and other dwarf species coexist with peaceful small fish, though baby shrimp are food for almost any fish that gets to them.
Common mistakeBuying unsexed platties without a plan for fry. Equal sex ratios produce harassment; one male with two or three females is the working ratio.
What most shops don't tell you
- 1.A single pregnant female in a 40L without a fry plan. The tank crowds within months.
- 2.Treating molly and platy chemistry as interchangeable. Mollies want harder, warmer water than most platy stock.
- 3.Hardy and forgiving in tap water. Two or three females per male spreads attention. Fry survive in a planted tank.
About this species
Platies are Central American livebearers that breed in hard water. Hundreds of colour strains exist. Less obsessive parents than guppies.
- Endler's Livebearer40L min · same group, similar adult size
- Guppy40L min · same group, similar adult size
- Molly80L min · same fish family
- Swordtail80L min · same fish family
- Sailfin Molly120L min · same fish family
- Amano Shrimpalso beginner peaceful, similar tank size
- Assassin Snailalso beginner peaceful, similar tank size
- Beckford Pencilfishalso beginner peaceful, similar tank size
- Black Neon Tetraalso beginner peaceful, similar tank size
- Black phantom tetraalso beginner peaceful, similar tank size
- Bloodfin tetraalso beginner peaceful, similar tank size
- Boesemani Rainbowfish tank mateslists this fish as a safe and recommended mate
- Bristlenose Pleco tank mateslists this fish as a safe and recommended mate
- Corydoras Catfish tank mateslists this fish as a safe and recommended mate
- Guppy tank mateslists this fish as a safe and recommended mate
- Kribensis tank mateslists this fish as a safe and recommended mate
- Molly tank mateslists this fish as a safe and recommended mate
- Peppered Corydoras tank mateslists this fish as a safe and recommended mate
- Sailfin Molly tank mateslists this fish as a safe and recommended mate
Plan grid
Key limits are shown above; this section adds planning detail: pH band, swim level, bioload and activity, and the radar.
Swim zones
Planning trait chart
Six indices for comparing species on paper before you spend.
- Beginner ease85
- Peacefulness90
- Community fit82
- Small-tank fit100
- Hardiness79
- Energy86
Numbers are deterministic planning indices from Fishori fields — not a scientific score of your individual fish.
Common setup sketches
Conservative patterns from Fishori fields — still run the pair checker for every species you add; sketches are not a stocking guarantee.
Tank mate intelligence
Pairs with corydoras, neon tetras, harlequin rasboras, mollies, swordtails, dwarf gouramis, otocinclus.
Pair-level compatibility with this fish as anchor.
Read the blocking rule on each pair page before experimenting.
Do-not-stock combinations on conservative hobby rules.
Compare with
Run a real pair check: Platy + Guppy
- Try Guppy — open the pair check.
- Try Molly — open the pair check.
- Try Swordtail — open the pair check.
- Try Corydoras Catfish — open the pair check.
Behaviour, temperament, and what to watch
Prose and lists come from the same record: read temperament first, then glass-level signals so you are not surprised after day three.
Peaceful and gregarious; males chase females less aggressively than guppies do, and groups settle quickly.
Stress / aggression triggers on file
- Sudden crowding
- Poor water quality
Fin nipping: Not a habitual fin-nipper, but individuals can still test fins under stress or in a crowded tank.
Predation: Not a predator toward similarly-sized community fish. The usual community caveats about mouth size still apply for very small fry or shrimp.
Territory: Not strongly territorial, but still claims a working area in the tank. Give it room to settle without overlapping the next species' patch.
Planted tanks: excellent — easy plant ideas
In the glass: typical and warning signs
- Busy at feeding time — expects food to hit the water predictably.
- Clamped fins, gasping at the surface, hiding non-stop, or refusing food after the first week.
- Rapid breathing when parameters swing — fix ammonia/nitrite first, then reassess mates.
- Low listed risk — still watch new introductions.
- Separate or rehome if injuries appear, one fish is pinned, or feeding becomes a daily chase.
- If water is stable but behaviour worsens, reduce stocking or remove the highest-impact species first.
Fish behaviour can vary between individuals and tank setups. Always observe new fish closely after introduction.
Care parameters: water, food, inverts, grouping
Chemistry and group rules sit here so you are not re-reading the same line from tank mate or temperament blocks. Swim level is in the plan grid above.
Hardness
medium-hard
Diet
omnivore
Mixed diet: a quality flake or pellet as the staple, with frozen or live foods two or three times a week.
Shrimp & snails
Shrimp: compatible in most setups. Cherry shrimp and other dwarf species coexist with peaceful small fish, though baby shrimp are food for almost any fish that gets to them.
Kept in pairs or small groups of 3 or more. Buy them at the same time rather than adding one fish at a time.
Livebearers breed every few weeks. Plan sex ratios, a grow-out tank, or rehoming routes before the first batch of fry lands.
- Hold 20 to 28 °C steadily on a real thermometer, not the dial on the heater.
- Aim for pH 7 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 60L published minimum for adults.
- You can stock at least 3 individuals (group welfare).
- Heater can hold 20–28°C without cooking cooler-water tank mates.
Explore and stocking hubs
Same library as the rest of Fishori: tank-mate index for this species, category peers, guides, and litre-based stocking lists where min tank on file is within the hub volume.
Plan with tools
Pair-level rules and multi-fish stocking use the same conservative engine — add this fish in the tank builder only after mates pass pair checks.
Filtration & heating
A 60L minimum tank needs a filter rated for at least 240L/hr turnover and a heater to hold 20–28°C reliably.
Plant suggestions
Platy does well in planted tanks. Plants compatible with 20–28°C and pH 7–8:
Profile status: verified · Evidence tier: high · 4 linked source(s). Fishori does not fabricate citations.
Fishori uses conservative planning rules based on these sources.
Confidence is explained in the summary at the top of this page (same tier as here), not repeated below.
How Fishori evaluates compatibility (same logic as pair and tank tools).
- Seriously Fish. Xiphophorus maculatus
Primary: aquarium size, water chemistry, behaviour, and compatibility (URL verified in upgrade script; recheck if site content changes).
- FishBase. Xiphophorus maculatus
Secondary: taxonomy, distribution, and maximum length in nature; cross-check with aquarium import lines and measured tank parameters.
- Wikipedia. Xiphophorus maculatus
Secondary: general species context; verify all husbandry numbers against a dedicated aquarium care sheet and your test kit, not a single table row.
- Wikipedia. Xiphophorus maculatus (platy)
Encyclopaedia overview; use specialist aquarium sources for your stock's real temperature/pH/footprint needs.
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.
- Fishori profiles work from typical aquarium trade sizes and hobby care norms. Specialist site checks and literature review for this species are not yet recorded here, so the ranges on this page are planning numbers rather than guarantees.