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I'm sure its cyano. Rock is over 3 years old in my system and this just popped up 6 months ago. I've done everything there is to do at this point. Everything ever suggested here at RC, i've now tried.
I'm just giving up and ripping the tank down in a few months. Just need to keep my corals alive in that time.
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Great spirits often encounter violent opposition from mediocre minds.
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