Hello I’m fairly new to the hobby and we have recently stocked our tank with it’s newest members..I do plan to upgrade my tank in the very near future..a few paychecks or so, however my current issue is with my Pictus Catfish..he always wants to swim at the top of the tank despite everything I’ve read they aren’t supposed to do that. I thought maybe he was lacking oxygen..so I got a bubbler and he still is swimming at the top even after lights out..my water quality is perfect according to my local pet smart that I took my water to be tested. I’ve tried everything even doing a water change and still nothing my other fish are totally fine and he is with a Red Tail Shark ,4 Serpae tetras, and a spotted Plecostomus. The red tail and the pictus are both juveniles right now as well..any input is needed.