So my betta had been acting a little odd the past few days. He's resting strangely on the bottom. His head is up higher. He also seems to be swimming like this. Doesn't seem liķe swim bladder because he has no trouble going up or down. He also can't seem to flare properly. Only one side sort of flares out when before he'd full on flare at me in the same situation. I'm worried because I bought another betta who had similar but much worse symptoms who died like 10 days after I got him. That was about a month ago. He's still eating and zooming around but I don't want it to become something. Should I just maybe up water changes? Add aquarium salt? Oh btw this is my mom's fish which I take care of. I'm still trying to talk her into a heater. No judgements.