I recently changed out my 10K halides for 15's, and also bumped up my magnesium a lot to help with a HA problem. The Coraline algae is growing like CRAZY. I had only a few spots on the side glass last month, and now it is completely encrusted. same with my powerheads :S.
my Mag is at 1550-1600 now, was at 1250 before i bumped it up.
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