awesome thank you very much, so i took out an affected coral and had a good look with magnifying glass and didnt see anything, im gonna still do dip anyhow but lets say it wasnt redbugs, what would cause coral to turn almost white in the middle,? the only thing i can think of is my mag was kinda low 1150ppm, which i guess would through alk and cal off aswell but they tested in range(elos). ill start with the dip and go from there.
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125 gal,40gal sump, 4 ai sol blue, 2 mp40es,swc 180 cone skimmer, kalk reactor, 2 tlf reactors(carbon& denitrate) uv light, refugium with mangroves
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