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Aquarium Advice FINatic
I have a bloom of some sort in my tank. There is some cyanobacteria, but there's some other junk on my rocks, too, that's less stringy and film-like. It's a greenish-brown and it's really annoying my button polyps and my mushrooms. I don't have a phosphate test, but I do use RO water, so I didn't think that was likely to be an issue. I've been in the hobby for over a year, so I'm fairly sure I'm not over-feeding. My nitrates are about 15ish (where they usually are). What is the deal?