I have the same problem and have been working for 2 years to eliminate it completely. It always returns but does seam better after a cleaning and water change; but it always grows back. I have a 200 gallon display so it takes a lot to clean, if not for my large corals I would have scrubbed with bleach and started over.
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Family Guy
Current Tank Info: 210 display, 3x250 MH,dual chamber Ca reactor, large skimmer made in KCMO.
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