I've had mine since late July and he is doing great. I don't feed anything with Sponge and am not entirely convinced it is necessary. They are a Fish that needs to be moved through the distribution system as quickly as possible to have a chance. The quality of the Specimen makes all the difference. These fish have a high metabolism so lose weight quickly. Thin specimens often do not have time to adjust and fade away. That's what happened with my first one. My second a final try was a fatter fish but still had to have the right conditions to adapt. He now eats like a pig and has fattened up but alas he did not do well in a community setting so he is in my 60 gallon breeder for now with a single Jawfish. They don't seem that disease prone like some Tangs but again will be intimidated by other more aggressive fish and will go off feed.