As long as he is eating all is good for now. Keep feeding him, use some vitamins too. How did you acclimate him? I ask because maybe he is having a little bit of a hard time with the difference in the water from the fish store to your tank, I would turn the lights out for 24 hours and see how it goes.
I got him off this site and did the drip acclimation for an hour. I will let him rest.
I got one cause I thought it was cool too....BUT I guess since it jumped, it didn't think I was cool
meowzer- he probably didnt think your (tank) was cool. lol you got your tanks running any cooler?