TankStockingHow many Platy in a 29 gallon tank?
A 29-gallon (110 L) tank comfortably holds about 10–15 Platy as a single-species display — a conservative range that leaves room for tankmates and a margin for error.
Platy key facts
| Adult size | 6 cm |
|---|---|
| Minimum tank | 10 US gal |
| Minimum group | 3+ (pair/group) |
| Temperament | Peaceful |
| Temperature range | 20–26°C |
| pH range | 7–8 |
| Bioload | Low |
| Swim level | All levels |
| Beginner-friendly | Yes |
Sources & confidence (1 species)
This backs the Platy size, tank and group figures used here. Each figure is read from the TankStocking species database (v2026.06); below is the care reference behind it and how confident we are in that data. Confidence reflects the source quality, not whether any pairing is safe. Full source list and the welfare model are on the methodology page.
- Platy Xiphophorus maculatus — Aquarium Co-Op platy care guide / FishBase Xiphophorus maculatus high confidence
TankStocking sizes this from a per-species footprint — the territory and waste a single Platy needs in a comfortable display tank — rather than the unreliable "inch per gallon" rule. On that basis a 29-gallon tank comfortably suits about 10–15 Platy. Keep a minimum of 3 — Platy is a social species that suffers in smaller groups. This is a comfortable display range, not a hard ceiling: stocking lighter keeps water quality stable and leaves headroom for tankmates and growth.
TankStocking's bio-load gauge alone would not flag a tank this size as over-stocked until roughly 24 Platy — but that is a model maximum, not the recommended number. It leaves no headroom for water-quality swings, tankmates, or growth, so treat 10–15 as the comfortable target.
Peaceful and undemanding, they mix with virtually every calm community species the engine knows. Like all livebearers they breed readily, so expect fry unless you keep a single sex. They prefer slightly hard water but tolerate a wide range.
Want a community rather than a single-species tank? The Platy tank mates guide lists the species the engine clears with Platy.
15× Platy
✓ Good starter plan15× Platy
About 10–15 Platy is a comfortable display level for 29 gallons — fewer is always safer, and leaves headroom for tankmates.
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Verdict
Common questions
How many Platy can I keep in a 29-gallon tank?
A 29-gallon (110 L) tank comfortably holds about 10–15 Platy as a single-species display — a conservative range that leaves room for tankmates and a margin for error.
What size tank do Platy need?
Platy need at least 10 US gallons, kept in a group of 3 or more. Bigger is better — more water means more stable parameters and more room to stock tankmates.
More on stocking Platy
Related guides on TankStocking — each scored by the same welfare engine as the planner.
Platy tankmates & community
Platy in other tank sizes
Stocking numbers are planning estimates — filtration, planting, and maintenance all shift the real ceiling. Cycle the tank and stock gradually. How this estimate works →