I do not test for calcium. I was told that if you get a white ring around your tank and/or sump at the water level your magnesium level is low. Has anyone noticed this? For those who test regulary do you find you also have to add Mg regularly? If so what kind of supplement are you using?
Tanks
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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