I know Piranhas are bad fin nippers, but myn have never really had a problem with it untill now. The big one that used to be the domanite one, is not anymore and he is getting new fin damage alost every other day, not bad but noticable. Also I am leaving town next wednesday and not coming back untill sunday, I figured i would feed them well right before I left and put a bunch of feeders in for that three day period im gone. Do you think the fin nipping will turn into killing when I leave also im taking the juvi rbp's out of there 36 gallon grow out and moving them to a 75 gallon after I get back from being out of town, will this reduce the aggression, and there is only three of them? Also I only feed once a day becasue when I feed twice they dont really eat much each time just a little so I dropped down to once a day and they do eat more, but is this a cause of aggression also?