Can anybody tell me what this flakey growth is and how I can get rid of it? Does anthing eat it? My sailfin tang, hermits and snails don't touch it. I've been battleing it for the past year or so by periodically picking it off the rock. While I was away last month my light timer malfunctioned a few times leaving the lights on overnight. The stuff really took off spreading to two other rocks. My pH, alk, and calc are all on the low side (working on that), nitrates are 0, and temp is 80-84.