I bought a new betta from petco literally like 2 hours ago. I put him in my five gallon tank, he is alone. The tank has been running for a week in preparation for a fish.
So here's the problem. An hour ago he was fine, swimming around exploring the tank. I fed him some pellets but he only ate one...i took the other out and gave him a flake, which he did not eat. Now his stomach seems a little bigger than usual(it was not like this an hour ago) and he is sorta floating diagonally in the tank, hiding beind the filter. The temperature is about 78-80 right now!! dont know what is going on.