Re: My purple on the live rock is being eaten away !! I agree with Henry, I'm still interested to see what the levels are for ph, dkh, calcium, magnesium and iodine. Those all can and will affect coraline and coral growth. I've decided if you get into this hobby, you'll become a water chemist by default! 
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Dana
Frogspawn, kenya tree, zoos, 2 pep. shrimp, 1 cleaner shrimp, 5 hermit crabs, assorted snails, 3 perculas, cherub angel, blue dot goby, orange spot shrimp goby, lawnmower blenny
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