Ham's been so lethargic today. He stays at the bottom of his tank and only goes up to the surface to get air; Sometimes his mouth opens and closes as if he was having difficulty breathing. He hasn't eaten anything for the whole day either, and that's saying something, because yesterday I finally got him to eat pellets instead of just bloodworms.
I'm so worried. I think I just overfed him, but he doesn't look bloated; then I also think it's because I changed his water (ALL of it, it was so murky...) yesterday, but... I just don't know. He's just lying down on the floor of his tank. He doesn't even react when I tap my finger directly in front of his face anymore. When he does move, it's only for a few seconds. Like, to go up to the surface, and then come back down again.
If he's sick, can you guys please help me pinpoint what's the matter with him? *sigh* I repeat, I can't sleep at all, I just keep on staring at his tank.