Good luck with your Achilles tang, it's a beautiful and very elegant fish. I'm waiting for my chance to try a CBB, but I can only seem to get frozen clams, everything else I have on hand is frozen food, I recently fed my fishes with San Francisco bay area mysis and they pretty much devoured it, with no However, I have not been able to do it again.I have had a Copperbanded Butterfly fish now for like 6 years. He slowly started taking frozen but I gave clams in the beginning. Now it eats like a pig and I hand feed it pieces of table shrimp and loves frozen mysis. I also have evansi anthias that are finicky at first but start them on calensis or cyclops if they don’t eat rich away. Lastly I am trying my first Achilles tang that I had in an observation tank and is now under quarantine with copper as it had ich. So far it is eating well and should pull through the treatment.