Being a fairly new person in the hobby ... I went out and bought the works for my Purple Tang: Green, Red, Brown, Purple... She only ate the green. (No I did not put all of it in the tank at once <img src="graemlins//silly.gif" border="0" alt="[silly]" /> ). I gave away all but the green. This stuff breaks up and floats around the tank. Messy. The tang eats what she wants and then the Turbo Snails decimate the rest. Smart little buggers. No matter where they are they come and chow down. Love it... but I digress.