Same goes for mussels.... what the heck do they eat? I have a mussel that has about 50 zoas on it. He tumbled around for about a week after I put him in the tank, then I put a small powerhead pointed towards the corner and I sat him in the corner. He seems fine now. He's only in a 10 gal tank with a 96 w. p.c. I feed cyclop eez daily with an assortment of other stuff in it, like phyto plankton, mysis, formula one, and chunked up pieces of those white square chalk looking blocks they sell at the counters of most LFS's. I think the chalk looking blocks are calcium, strontium, etc, trace element blocks. Anyway..... I think my mussel is doing fine. It opens up when the lights come on in the morning and anchors his foot down and then late in the evening, he lifts his foot and closes up. I've had him almost a month, but I can't really seem to get a definitive answer on what they normally eat. He hasn't died yet, but if he's missing something in his diet, I'd love to fix it. Most LFS people I ask have no clue....