| how long have they been together? if im not mistaking, these arent new to you are they? im thinking it might have been some kind of deco that got him ...although fighting between them is always around, its not usualy to do damage that severe...the older and bigger they get, they almost do somersaults in their tanks and anything that sticks out or is hard, they will injure easily on that....right now id keep the prestine water as most have said, and if you can find fish protector and some stress coat+, that will help alot....I hope he doest better !! | 
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