How did you acclimate? He didn't puff in any air, did he? How about water parameters? What other critters do you have in there?
If you update "my info" with your critter list/equip/tank size, we may be able to help. I don't think I've seen many puffers being lazy (at least not in the
LFS), they all seem to be out front telling me to buy them! LOL! Sigh, one
fo these day, very soon....
I imagine, like bog says, they can become lazy, my cleaner shrimp was lazy too....didn't clean worth a darn.....