I have these little buggers all over my sump. Not a single one is in my main tank (as far as I know). I cant imagine a reason to get rid of them in my sump. They are natural to the ocean and only really sting corals...
Joe's Juice is a waste of money according to my lfs
. They will not sell it. They say it is just basically kalk
mixed with some other stuff. The owner of the store is a hobbiest that decided he could make some money and reduce his costs of his home aquarium. I think the original idea on this thread is a great idea.