I get huge coraline growth under my PC's and under my MH and I do dose with MG. It totally covers my equipment 1st but vinigar takes it right off. Every once in a while I scrape it off and let it grow back as you can see on righthand side of 29G 
http://www.canreef.com/vbulletin/sho...t=22291&page=3
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Murray
I reserve the right to hijack any thread I want to!!
My carbon footprint is bigger than your carbon footprint !!!!
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