I checked the phosphates a couple of months ago and the levels were not unusual. I will have to have them tested again. I upgraded my skimmer recently so that should not be an issue.
I'm considering taking each rock out and scraping as much of this stuff off as I can and rinsing well before putting back in the tank. I didn't want to put the rock back in the tank if it can regrow from any bits I don't manage to scrape off. That is why I was considering keeping the rock in complete darkness if that would prevent any missed bits from growing more.
I harvest a little macro algae from the main tank on a weekly basis. About a small handfull. The stock level is low and I don't feed that much or that often.
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