I have Vermitid snails on one of the rocks in my tank. They were in my 2.5 gal pico and never really caused a problem. the only time they threw any webbing was when I did a water change or disturbed the tank in any way. But it never really seemed to bother anything in the tank. Now that they are in my 46 gal they seem to constantly throw webbing (probably due to the flow in that area of the tank) and they annoy the crap out of my GSP and any other coral nearby. I moved the GSP because they stopped opening due to being covered by webbing. After 12 hours, the GSP seems to be coming out now. Is there a way to remove them? Just break them off the rock?