Alright guys, i just picked up a couple 2" red belly piranas today and was thinking of putting them in my 240 w/ my 6" monos. Is this a bad idea? I've never kept piranas, so i don't know much about them other than they can clean a chicken bone in a matter of minutes. Are they really as aggressive as they are made out to be? Will they nip at my cichla? Any input is much appriciated! Thanks!