Normally rest on the bottom on the tank? I've had Kiki for almost a week now and each day he seems to spend a little more time hanging out on the bottom, then he'll just shoot to the top and swim around for a few minutes. Then its back to the bottom.

I don't think he's got fin rot or anything.Not that I can tell anyways. He's now eating bloodworms, won't take anything else right now( didn't eat for the first 4 days I had him. I have added aquarium salt, has a heater, filter and his tank is clean. The temp in there usually sits around 79-82, depending on the time off day.
Any advice?
Thanks, in advanc.