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This is related to an earlier thread, http://www.aquariumadvice.com/viewtopic.php?t=101087&highlight= but I'll post it separately so its easier to find. I had green water, three times this summer, first two resolved with 3-day blackouts, but it came back. The third time I cleared it up using...

I've had green water now for the third time this summer in my heavily planted, well-established tank. 3-day blackout gets rid of it, but it comes back in 2-3 weeks. Any ideas? I probably have excess organics due to overpopulation and should reduce the fish count a bit. Here's the setup: 29...

Thanks to the folks who posted about cyanobacteria. That's what I had, and indeed, the recommended treatment, Maracyn (erythromycin) worked. Of course I was loath to hit my tank with antibiotics when I wasn't sure what kind of algae or non-algae I had. What really convinced me were the...