Can a betta live with guppies?
Edited by Marin Hale · last reviewed October 29, 2026
Sometimes, with care.
Male guppies' long, colorful tails look like a rival betta and often trigger attacks, and guppies may nip back. Female guppies in a 20+ gallon planted tank work best.
Plan on a tank of at least 20 gallons for both. Each fish alone fits a smaller tank, but together they need room to avoid each other, plus plants to break up sight lines.
By tank size
| 5 gal | 10 gal | 20 gal | 29 gal | 40 gal | 55 gal | 75 gal |
|---|---|---|---|---|---|---|
| No | No | Maybe | Maybe | Maybe | Maybe | Maybe |
Below 20 gallons there isn’t enough room for both, so the answer is no.
How to try it
Use a 20-gallon or larger tank with dense plants (floating plants, tall stems, broad-leaved plants) so each fish can break line of sight. Keep one betta with a group of at least 3 guppies, using female guppies only or several females to each male; avoid fancy-tailed males, whose long colorful tails are most likely to trigger the betta.
- Only add fish to a mature, fully cycled tank, and check that temperature sits in the 75–82°F range both species share and that pH is around 7.0–7.5.
- Add the guppies first, preferably females, so they settle in and the betta doesn't treat the tank as already its own.
- Rearrange plants and decor, then add the betta, ideally after feeding it so it is less likely to go after the guppies.
- Watch closely for the first few hours. Brief flaring or a few chases is normal, but separate the fish immediately if any fish is injured or one is repeatedly chased, cornered or pinned.
- Feed everyone at the same time at first, with food in two spots, so the betta stays busy and the guppies can eat without being crowded or chased.
Warning signs in the first weeks
- Torn, split or frayed fins, wounds, missing scales or bite marks on any fish. This means separate them immediately.
- The betta repeatedly chasing, cornering or pinning one guppy, especially a male with a long tail.
- A guppy hiding constantly, hanging at the surface corner, or refusing food.
- The betta flaring at guppies all the time, or guppies nipping at the betta's long fins, which can show up as clamped fins or a betta that stops exploring.
Backup plan: If you see any injury or ongoing harassment, move the betta or the guppies to a separate tank right away rather than waiting to see if it settles. Guppies do well in a group of 3 or more on their own, and the betta does best alone, so a permanent split is a reasonable outcome.
How we reached this verdict
| Pass | Water temperature | Both are comfortable at 75–82°F. |
|---|---|---|
| Pass | pH | Both are comfortable at pH 7.0–7.5. |
| Pass | Water hardness | Both handle water hardness of 9–15 dGH. |
| Pass | Size and appetite | Neither is small enough to be eaten by the other. |
| Watch | Fins | Male guppies' long, colorful tails look like a rival betta and often trigger attacks, and guppies may nip back. Female guppies in a 20+ gallon planted tank work best. Known behavior, from hobbyist experience rather than the data rules. |
| Pass | Temperament | Temperaments are compatible. |
Side by side
| Trait | Betta fish | Guppy |
|---|---|---|
| Tolerates | 75–82°F (24–28°C) | 72–82°F (22–28°C) |
| pH | 6–7.5 | 7–8 |
| Adult size | 2.5–2.8 in | 1.5–2.5 in |
| Temperament | Semi-aggressive | Peaceful |
| Smallest tank | 5 gallons (19 L) | 10 gallons (38 L) |
| Keep at least | 1 (fine alone) | 3 together |
| Swims | Top | Top, middle |
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Verdicts come from cross-checked species data and our compatibility rules. How verdicts work · Guppy care