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Old 08-22-2014, 04:26 PM   #1
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Constant cyano-- please help

I have read everything I can about cyano, what to do, and how to get rid of it. It is all over the gravel and climbing the walls. Not on the corals, yet. Sorry I can't send a pic, but I just cleaned the tank and I didn't think. Before I cleaned I tested.
PH 8.03
Salinity 1.026
Temp 79 degrees
Mag 1380
Nitrate 10 ppm
Phosphate 0
Calcium 419
Ammonia .5
Alkalinity 6 dkh
Nitrite 30ppb

I am running a 28 gallon cube. A month ago, we changed from the CFL that came with it to LED's currently running at 40% cool white and 80% royal blue. Because I have been vacuuming out the cyano so much, my 3 inch sandbed went to 1/2 inch in the four months I've had it. On August 7, I added gravel to half the tank. On the 15th, I added to the rest of the tank. Gravel was rinsed thoroughly, but the next day, cyano was back. We even vacuumed our sump. Running the filter rack with fiber in top section, Chemi-Clean Blue in second, and a mixture of nitrate and phosphate sponges below Poly-Filter. Change 4-15 gallons of water every 5-8 days. Ok. Can't think of anything else. Corals are mixed softies, hard, SPS. Fish are pajama cardinal, royal gramma, two clowns and purple firefish. Tank has been running for two years. Haven't added anything new for at least a year. I do not dose. I use ro/di for everything with IO Reef Crystals. Long, but thorough. any help, or am I just a dummy?


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Old 08-22-2014, 04:38 PM   #2
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How much flow do you have?
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Old 08-22-2014, 06:35 PM   #3
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I have two 266gallon pumps with a wave maker. I have two Koralia powerheads running 650 gallons per hour.


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Old 08-22-2014, 06:41 PM   #4
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My husband just helped me take the powerheads out and they are soaking in Magi-Klean. By the time he got home, four hours after I changed four gallons in the tank, the cyano was back on the gravel. A heavy sprinkling, but definately back. He helped me change out half the water in the tank and vacuum the red gravel.


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Old 08-22-2014, 06:55 PM   #5
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You need to beat the main cause. The low alk isn't helping your battle either. What kind of lights are they and how long is the photoperiod? Feeding less should also help.


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Old 08-22-2014, 07:03 PM   #6
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My lights are newly installed LED's as mentioned above. They are set to slowly come on at sunrise and start to go actinic at sunset, so photoperiod is about 12 hours, same as for us. I feed every 2-3 days. Mostly Cyclop-eeze (probably spelled wrong ) and frozen Mysis. Both are washed before feeding. Once in a while I will feed Spirulina, or put in a piece of nori for a couple of hours. Every other week, I feed my corals with a syringe and either Marine Snow or Coral Frenzy.


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Old 08-22-2014, 07:06 PM   #7
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Sounds like you got feeding under control . I'd definitely raise the alk up a bit to 8 or so. This should be done slowly over a couple days. Cyano sucks, I've dealt with it twice. I'd cut the light period down a bit too.


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Old 08-22-2014, 07:22 PM   #8
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Even with LED's? Didn't think I'd have to worry about the photoperiod with these.


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Old 08-22-2014, 07:26 PM   #9
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Oh yeah, raising the alk. I've been reading some interesting articles regarding the chemical composition of raising alk. The best suggestion was 2.7 tsp per gallon of top-off. That will take me a minimum of two weeks to get that in there. Other than dosing applications, which confuse pH and calcium, what would you suggest?


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Old 08-22-2014, 07:35 PM   #10
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Constant cyano-- please help

What brand of LEDs are they? Some are much more powerful than others. Are you just doing weekly wcs and pulling out the cyano then? Or twice weekly? Do you blow your rocks off when you do a wc? Sorry for so many questions lol. Just trying to figure out and help the best I can


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