AJ
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Cyano bacteria and lighting
How much does lighting affect cyano algea ?
I find it interesting as there is one older bulb in the 180 and that area has loads of cyano, where there is nearly none in the other two thirds of the tank.
Is there a meter that measures kelvin output?
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Fishtal
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As bulbs age their spectrum shifts toward red and cyano likes that color. 
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AJ
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It seems pretty weird though.
How a 14k bulb can get reddish?!
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Fishtal
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From the way Deb explained it to me long ago, the change isn't enough of a change for our eyes to perceive but enough that algae notices.
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CableGuy
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What kind of bulb? T5, MH, PC?
I find it is more of a nutrient issue, not a lighting issue even though you might be seeing it more under one light.
-Adam Learning more everyday!
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AJ
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It's a 250 watt DE halide.
I wish I took a pic of it. It really was remarkable.
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CableGuy
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According to Sanjay's latest article on MH's, it seems they can last quite a while before they go bad.
I think after 1.5 years the PAR was at like 78% and the spectrum really didnt shift yet.
-Adam Learning more everyday!
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slosht
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Maybe the cyano doesn't like high intensity and starts to thrive after the PAR starts to decline?
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cmpenney
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Could be Josh,
I'd look into replacing the bulb and see if that helps. Worse case you are one bulb ahead for the next replacement cycle.
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AJ
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I did change out the bulb for a better one I had. But alot of the cyno is back (only in that area) I found out though, that that particular area is getting blasted with sunshine in the afternoon until sunset. Perhaps that is a contributor?
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cmpenney
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Yeah that would do it.. Anyway you can shade it somehow?
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AJ
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I'll have to stop in on an afternoon, and see what i can do.
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