Ok, it seems your water changes are a bit infrequent, so he might just be sick from poor water quality. Maybe try changing the water 100% once every 2-3 days and see if he shows any signs of improvement.
If you don't have the nitrogen cycle set up, the filter isn't cleaning the water, so I would just toss it if your tank isn't cycled...
Edit: I see you cycled it, nevermind! Maybe you can quarantine him so you don't mess up your cycle and change the water more frequently in the new container.
Double edit: Wait, did you cycle it in 24 hours, or did the cycle finish 24 hours before you added the fish?? Sorry, just wondering if you've got the nitrogen cycle going, sorry for the confusion :/
Last edited by TaylorW; 02-23-2011 at 04:56 PM.