Plague is right, I have tried everything: Calcium, Salt, Kalk, Boiling water, Joes Juice, I have gone so far as to boil rocks that have too many to kill, but then you end up with a peice of base rock, which sucks. I would like to know more about the filefish, I will have to research that one, Darren if you find one and it works please let us know.
Dave