Hey guys, so I got a second tank and I have had it for about a week and a half now, there's one betta in it and he's been acting quite strange, he doesn't move around too much, except at feeding time, the rest of the time he floats in one spot and usually ends up leaning to one side ( I'll attach pictures) the first time I saw him do this I actually thought he was dead. When we first got the tank and fish it was really dirty, the person who owned the fish before had never done a cleaning or water change. I immediately cleaned it and did water change and cleaned his gravel. I also did a 30% water change yesterday as it had been about a week since the last one. Currently his water parameters are: PH - 7.5 Ammonia - 0 Nitrite - 0.3 - 0.8 that colour was kind of in between on this reading Nitrate 20 Temperature - 78 degrees fahrenheit Not sure about the tank size but I am pretty sure it's a bit less than a 5 gallon. It has a filter, heater and light. Im just really unsure if I should go ahead with a water change or if the fish may have an infection which I should treat with medicine!