Crypt,
Back to the tang feeding, my tangs don't even seem slightly interested in the algae sheets, so I have not tried lettuce yet. I think that they are getting most of their herbivorous diet from the formula 2 pellets, and the algae that used to overtake my tank. Good luck with getting him to eat, I would love to have a PBT, but I have always been scared from the reviews. Plus, I had 2 blue damsels (4 bucks each) kill a blue hippo (40 bucks) in two days, so until the damsels go, I will not buy another blue fish.