I had them on the rocks got them under control , then they took over the sand bed ,
I finally got tired of them replaced the sand bed about a year ago 6 months later they were back , my sand looks like a carpet again , I was told many times I over feed but I know for a fact I don't , every other day is my schedule along with weekly water changes ,
I would love to do another sand change but I have like another Eco system under the sand bed now , my lobster burrowed out a lot of the bottom now hermits snails pistol shrimps , along with a bunch of emerald crabs and porcelain crabs my gobies love it down there too , they sell something that will take out the vermid snails but it would also wipe out all my inverts ,
I just bought 3 abalone's they seem to be cleaning house I'll have to see how long they get things cleaned up , than I can remove them and put them in my predator tank . so they don't move on to my coral ,