I have a mating pair in a 28 gallon tank-no other fish. Am I able to introduce 2 more smaller discus or will the pair pick on them. My discus are 8 inches each. Do I need a larger tank? Thank you.
Never have any other fish together with a mated pair.
They will be sure to pick on the new comers.
They can even kill them.
28 gallon-tank is okay for a breeding tank.