This thread is so old but I must add to it! I just got a Kole Tang a couple days ago. He is in QT with some other fish, going through TTM. I'm sitting here watching him go around the whole tank and clean up all the poop. There wasn't much since I just moved them to this tank yesterday but it's just about clean. Yuck!! I got him so he'd be a good algae grazer but I had no idea they are poop too! Poor thing, he just keeps picking at the day old PVC.