I have about 40 but no corals in the tank most of them are in so I don't mind. I have spent upwards of an hour each removing a few most though have the foot so far into the rock there is no way to get them loose while in the tank. I think the problem with killing then in the tank is dead nem makes one heck of a mess and I would be afraid of trashing the tank. I wonder if you could remove the rocks they are on and then try removing them and put the rocks back in?
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