well thanks all for giving some insight on multiple Arrow's.. like i said before wish i had known this when i first bought my baby.. to take a chance with the one i have now that is roughly 16 inches would be too stressful on me.. i couldn't watch them beat and batter themselves up with out chickening out and moving one to another tank.. maybe if they were both babies i could go for it, maybe i still will if i see a couple of silver babies that i cannot resist..thank you and please keep posting because very interesting to read.. sort of a mystery unfolding... because i still think time will tell.