I had four piranhas in a 30 gallon tank. My fiance and her brother tried to move it one day and the tank shattered. I kept the piranhas in a ten gallon tank for a couple days untill I could purchase a larger tank. While in the ten gallon tank the little bastards ate the smallest of the four piranhas. My question is if i were to raise some RBs in a 30 gallon tank untill they were a comparable size to the ones in my 55 gallon if they would be able to live harmoniously. My tank just looks kinda bare with three little Rbs in it. If not, any recomendations on what else i might be able to put in?