My tangs, yellow and sailfin, rabbit fish and even the angels fight over the stuff. Like I said Amazon has it or any Asian market has it. It is identical to the green stuff at the LFS
for $9 and 25 sheets. I haven't tried other varieties as this seems to keep them all super fat. They also get frozen foods, but I really bulk them up on this stuff. It hold together pretty well in the tank and after I slice it up I get over a hundred sheets for less than $9. Try the garlic trick on the kole tang and see if it works.