I had a Sand Sifter that did the same thing, Had him 2 days and legs came off. This was 1 day before I noticed my fish becoming sick. THIS LED TO HLLE. I tested water a day before I got the star, and all was good. But all hell broke loose after that. I figured out that the cause of the HLLE was more than likely me changing Filters and removing Air stones. Everything is great now, back to old setup. So maybe something in Waterville isnt good, or a sign of something to come.