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Old 01-03-2014, 09:32 PM   #11
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I would do larger than average water changes to address the nutrients in your water column. The readings might be 0, but it is being consumed by the cyano at this point. Increasing the flow will help, but the nutrients will still be there and appear in an algae outbreak. A product like phosguard can also help with maintaining the levels, but a large water change will get you ahead of the game first.
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Old 01-03-2014, 09:38 PM   #12
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Grr...even though I already did a 100% change over the course of 5 days just last week? Tonight I did 40%.
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Old 01-03-2014, 09:45 PM   #13
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Hm, well siphon out the cyano and see if it returns. It has to be feeding off of something.
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Old 01-03-2014, 09:47 PM   #14
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I couldn't get it all, but I got most of it.
I re-positioned my powerheads to their previous positions (well, as close as I could get them), and cut the lights back to 8hrs a day.
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Old 01-03-2014, 10:52 PM   #15
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Could this be blue-green algae, instead of cyano? If so, does it really matter?

And here an interesting article on the topic...using diatomes to prevent other algae:
Hot Tips: Algae Control — Advanced Aquarist | Aquarist Magazine and Blog
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Old 01-04-2014, 12:22 PM   #16
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I'm going to do another 30% PWC in about an hour, and will try to get the gunk I missed last night. We'll see what happens.
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Old 01-04-2014, 02:15 PM   #17
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You are on the right track, that's for sure.
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Old 01-04-2014, 02:18 PM   #18
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PWC done. Fingers crossed.

Sent from my SPH-L710 using Aquarium Advice mobile app
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Old 01-09-2014, 10:11 PM   #19
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Bah, it's growing back on the rock again. It's not red, though, like most cyano that i'm reading about. It's dark green.

I started a phosguard run yesterday, so hopefully that'll kick it in the pants. I need to get a salifert PO4 test, too, since my API test kit doesn't have the resolution required (goes from 0 to 0.25 ppm), so I could have had high PO4 and it just didn't register w/ the kit.

I'm pondering the thought of turning off the lights for a few days, too. I have duncans, torch, frogspawn and zoas...they should be OK for 72 hours of no light, right? The room has ambient light in it during the day, so it won't be complete darkness.
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Old 01-09-2014, 10:31 PM   #20
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Continuing the PO4 discussion, should I siphon below the surface of my sandbed when I do my PWCs? Right now, I just try to get any loose junk off the surface, but don't push the siphon into the sand at all.
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