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Old 11-02-2004, 02:38 PM   #11
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...when the actinics come on in the morning the sand is pristine. It's 100% white with not a trace of red slime. Then, after 60 minutes it's covered with brown film. After that the hallide turns on and it just gets worse until the end of the day. Then, the next morning, it's clear again. What the heck?
I think you misunderstood my question.
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92-gallon corner tank, 100lbs of LR, 140lbs of sand, 250watt 10,000K MH, 110watts of actinic PCs, Mag 7 return, custom refugium, AquaC EV180 w/ Mag 5

Female lyretail anthias, eyelash blenny, tomato clown, saddleback clown, firefish goby, 2 sand-sifting stars
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Old 11-02-2004, 02:46 PM   #12
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Don't know, did not have that experience. Sorry...
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Old 11-02-2004, 09:22 PM   #13
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Gets better overnight..Could be your clean up crew. Are you currently using a sponge of any type? I have plenty of algea and some cyano, however, I have never witnessed it simply disappear over night and reform in the morning. The only other thing I can think of, and this is a long one, maybe there is some growing in some unseen spot, loosening up and dumping on the sand. Be nifty to see a pic of before and 60 minutes after..
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Old 11-03-2004, 10:26 AM   #14
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I can arrange that. I'll have to change the timing on the lights so they come on after I get home from work. I am usually only able to notice this on the weekends.
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Old 11-03-2004, 11:06 AM   #15
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There is nothing unusual about the way the algae is behaving. Both cyano and diatom algae are quite photosynthetic and like anything that is, stretch's out when the light is abundant and recedes when it's gone.

Algaes of any kind need two primary things to survive, light and nutrient. Since this is a reef tank starving the algae of light would be counter productive to coral health. It would also be a shortlived solution since it will slow down the use of the nutrient and do nothing for it's elimination. The only thing you can do otherwise is starve it of nutrient. Diatom is mainly fed from silicates which would come in through the water source. I would definately suggest checking that.

Cyano is mainly fed through organic and inorganic PO4. That can come in through many sources but primarily foods fed to the animals. Cyano also has the ability to manufacture it's own nutrient to a small degree making it much harder to remove. Cyano can process these nutrients so fast in fact that if you add foods it can easily sorb the nutrient so quickly the inorganic PO4 may never show up when testing. The best means to eliminate cyano is through the use of non-aluminum based PO4 granular sponges. It will remove all forms of PO4 and then work on removing silicates thereby killing both problems. Eliminate the PO4 and you eliminate the algae.

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