Breeding in a Community Tank

[bruceanthony]

I have a 30g community tank with lots of different kinds of fish in it, including a guppy and a zebra danio that both look like they could be close to spawning. If they're left to just do their thing without a breeding box or a separate tank, what are the chances that any of the eggs will survive?

 

[Fishfur]

Very small for the danio, as they both eat their eggs and fry if any hatch. Guppy is a live bearer so it will have small fry, and some may survive. If you provide lots of floating plant cover and some mosses, it will help increase the chances some will live. You might even get a danio, though it is not very likely.