One of my turbo snails constantly crawls over the rock my yellow polyps are on. The last week or so I've noticed their number dwindling. Do turbo snails eat polyps or do you think since it's crawling over them they're getting dislodged? I never see my emerald crabs near them or any of the other snails. I've also got blastomussa wellsi and clove polyps and nothing ever goes near them.