^^^What he said^^^
All too often, people are in a great big hurry to rid their tanks of various "pests" What they fail to understand is that, in most cases, these critters are growing in number because of poor husbandry on the part of the aquarist. Correct the problem (usually excess nutrients), and the plague will die back to a reasonable level. No real reef system, using live rock as most do, will be without countless little critters, nor should it be.