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Old 03-22-2012, 10:44 PM   #1
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Cyano with undetectable phosphates! Why?!

I have cyano but my nitrates and phosphates are undetectable on the test kits. Why is this? How do I get rid of it? All I've read is to lower phosphates and it will go away. It has not! I have even ran gfo in a bag for a day a couple of times. I also vodka dose. Other than that, everything is doing great.mit isn't a lot, just get a little on my glass and back wall and return nozzles.



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Old 03-22-2012, 10:57 PM   #2
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Not all phosphates are detectable by tests.
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Old 03-22-2012, 11:10 PM   #3
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Also they're probably undetectable because the algae is consuming them. Cyano doesn't need much to thrive.
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Old 03-23-2012, 10:34 PM   #4
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Then what else do I need to do to stop it?
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Old 03-23-2012, 11:54 PM   #5
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What kind of water are you using? Ro/di? The phosphates and nitrates are being consumed thats why the test are reading 0 if you have algae you nitrates and phosphates! Vodka dosing takes weeks sometimes months to work. Are u using a skimmer have you tried running it on the wetter
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Old 03-24-2012, 07:57 AM   #6
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You should siphon out as much as you can each water change too. Don't blow it off rocks. Cyano doesn't need much to thrive like said before. I had dealt with it for 6 to 8 months. Still have some now but manageable.

I did all this and not sure if one thing did it or all.

Changed bulbs
Lower hours of day light by 2 hours( temporary)
Dosed magnesium
Covered a window by tank better. Less direct sun light.
Bigger and more frequent water changes. Siphoning out as much as possible.
Ordered Cerith snails. Heard they will consume it
Chemi pure elite I think helped with parameters.


Just like you I have un detectable phos. Only 10ppm of nitrates at most. Now down to under 5ppm.
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Old 03-24-2012, 10:09 AM   #7
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I use ro/di. I just installed it a month ago and it tests 0 tds. I should state that there is not any significant cyano. Just enough to be annoying. It gets on my rescue coral and is on my return nozzles making them an ugly brown. A tiny bit on my back wall every now and again. Some may even ask why I'm complaining because there is so little. But I didnt understand why when my params are near perfect. And whats perplexing is I have cyano but can't even get my chaeto to grow because there's no nutrients.


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Old 03-24-2012, 10:49 AM   #8
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Also, take into consideration that these test kits are hobby grade.
I have witnessed chaeto not growing in very high nutrient tanks as well as low nutrient environments. There are other variables.
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Old 03-24-2012, 04:00 PM   #9
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Yeah, this is fairly frustrating for me as well. While my cyano is hardly out of control, it is annoying the crap out of me. My Nitrates are consistently below 5 and my phosphates usually at 0.25. I have lots of macro.
Yet the red still spreads. Le sigh.
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Old 03-24-2012, 09:48 PM   #10
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Could it be the vodka dosing? Should I start using microbacter 7 with the vodka? Or stop vodka all together? Or something else?
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