Who Gives A Fish Forums

Maybe give API aquarium salt a shot, at the right dose for his tank, and bump the temp up to around 80. See if that helps him perk up. Fingers crossed it does.

I'm no expert, just got back into the hobby last year, but I'll try to help you out. A few questions to start - what kind of plants are in the tank? Have you run a water test recently, checking for nitrite, ammonia, pH, and double-checking the temp in that tank?