The short answer
Yes — plenty of fish will breed in a community tank. The problem is that almost every fry gets eaten, often within minutes. In a mixed tank, newborn fish and eggs are simply food for everyone else, including their own parents. So “will they breed?” and “will any babies survive?” are two very different questions. Breeding is easy; raising the young in a community tank is the hard part.
What breeds without any effort
Livebearers are the champions. Guppies, mollies, platies and swordtails deliver fully-formed, free-swimming fry and reproduce constantly — you’ll get babies whether you intended to or not. See our guppy care guide and how do I breed guppies.
Egg-layers like corydoras and angelfish may also spawn in a community setting, but their eggs rarely last the night. Shrimp such as cherry shrimp breed readily too, though the shrimplets are picked off by fish — more in how do I breed cherry shrimp.
Why the fry disappear
A community tank is full of opportunistic eaters. Fry and eggs offer an easy meal, so survival in an open tank is close to zero unless there’s serious cover. This isn’t cruelty — it’s normal fish behaviour, and it’s why hobbyists who want babies plan ahead.
How to actually save babies
- Dense planting — floating plants, moss and thickets give fry somewhere to hide the instant they appear.
- A breeding box — a mesh trap inside the tank protects fry or a pregnant female from adult mouths.
- A separate tank — the surest method is to move eggs or fry to their own grow-out tank. See do I need a breeding tank and what do I do with baby fish.
Browse aquariums for a grow-out tank.