So I have two tangs, a hippo and a yellow. I think that one of them is eating the Xenia. It used to pulse more, but it seems that the pulsing hands have less fingers now a days. I have made it a point to feed nori daily, but I was wondering if anyone had any other ideas? Covering them with a crate like structure? Could anything else be eating them that I should look for? The parameters in my tank are good; I have SPS corals and a clam and all are thriving, so it is not pH.