Greetings, all, I am standing up a new tank, and purchased some used base rock recently. One would think the prior owners were trying to breed vermatid snails by the sheer volume of their tubes on this rock. Surfaces and crevices alike are covered. The rocks are all in a 10% bleach solution, but I am nervous even that may not kill them. Does anyone have direct experience with bleaching rock and successfully eliminating the vermin heads? I know the tubes will not dissolve, but just wondering how tough they really are.