My fish had been doing fine as far as I know until today when I did the usual water change, where he was really panicked for some reason.
So immediately once I put him back in, he started acting strangely. Just really nervous and swimming around frantically. He's usually a little spastic, but not nearly so much.
So I've been keeping an eye on him since then and he's getting worse. Like he just keeps floating straight up to the top and can't really seem to swim down. He's definitely trying to but just can't. So he's either really lifeless-seeming at the top trying to swim around or starts to float to his side.
It really doesn't look like his fins are hurts, so I don't know what's wrong. Could he just be really bloated or scared? Some other type of sickness? I feel really bad. It seems like he might be dying if he keeps floating like that and being unable to balance himself.