I use Ocean Nutrition (green, brown, red) and Julian Sprung's green/purple/red--looks, feels and smells like chewing tobacco!
I cut 2x3" squares of all and put one of each back to back and fold them so about 1/2-3/4 of an inch is below the clip and some sticking out the sides. After that's eaten down (not long!) I take the part in the clip and turn it so that the majority of it is hanging--the several plies make it last.
ALL my tangs,butterflies, and rabbit fish eat these sheets fast. The wrasses and damsels also like the "crumbs" that float their way!
Regal
Yellow (2)
Sailfin
Vlamagi
Eiblii mimi
purple
Powder Blue
Blonde Naso
Pyramid Butterflies (3)
Orange spotted rabbitfish