I have two male flowerhorns in the same 125 they both swim around and have many places to hide and claim as there own. they are close is size and chase each other around the tank but never really go at it. The smaller one was swimming fine then one day he started swimming on his side under the filter. I figured that he just liked the current flowing over him. Recently he has started doing this more and more outside of the filter. I thought maybe he had a weak fin but he does it on both side so im not sure. Was wondering if you have observed this before and if you had any ideas or suggestions.
