Feed Your Fish
These are not normal foods for they will create special effects on the fish. They are both entertaining for both you and the fishes. However, some of them may dislike the pizza after a few bites. Perhaps, increasing their intimacy level by tickling them with finger cursor will gain back their interest in pizza. Try it out, but pizza is not their primary food and hence does not feed them well. If you have taken good care of your fishes, they may begin to breed as soon as they reach maturity.