I have had 4 piranhas that I got as babies about 2 months ago. They are about 2.5 to 3 inches in length. I have them in a 30 gallon tank. I just recently got a 125 gal tank. It is almost all cycled and I have 10 baby (.5 to 1 inch) p's in it. I am wondering when it will be safe to introduce the 4 bigger guys in with 10 babies? Right now in either tank if I add any fish at all they attack like crazy. I added a danio and the babies chased it till they got tired. Basically I don't want to add my larger p's and have them kill all of the babies. thanks for the help.