I am asking this question for my mother who is also new to reefing. she has a 46 gallon bowfront tank she has about 30 pounds of live rock. 2 clownfish 1 sailfin tang, 1 royal gramma, snails, crabs and a cleaner shrimp. The gramma and shrimp died today dent know from what looking for insight. She has some worm looking things coming out of her rock. They aren't bristle worms. its kind of white iridescent with a round head and it is wound up in the rock. could this have killed them. The salinity and tests all read perfect. Just don't understand. Anyone has a clue let me know. thanks