Thanx for all the input on my other post guys. Now for another question. I fed my piranha half a cube of the frozen blood worm stuff. They didn't got for it right away. I think it was because of the light. So I left it in there over night, and the next morning they were picking on it. So by the afternoon, it was gone. Then I put two baby red rosie in there in the evening. The piranha chased and nibbled on their tails a little, but didn't eat them. Once again, I believe it was because of the light. So I decided to give them some blood worms to eat and if they wanted to, nibble on the the rosies. When I put the blood worms in, the rosie's started eating it all! Then next morning (now) I see that the rosie's tails are almost gone, so the piranha must be eating them little by little. What should I do? Also, is it ok to have just two piranha? I have a 55g tank for just the two of them, will fighting be a problem? Again, any input will be greatly apprecieated. I am a noobie who has wanted piranha for a long time. Thanx guys!