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Old 08-16-2006, 01:52 PM   #1
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RODI/Phosphates/Cyano

I'm working on the SO to get a RODI system for my birthday in a couple months.

Meanwhile, cyano has taken over my fuge and is making an appearance in the display tank. I've been keeping it cleared off.

I've tried various phosphate sponges, pads, media, etc., nothing seems to knock it down.

As long as its not growing on my various polyps, do I need to worry about it in the meantime? Are there any other problems from cyano other than the fact that its ugly?
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Old 08-16-2006, 02:05 PM   #2
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Quote:
do I need to worry about it in the meantime?
I would say yes. Mine overtook my tank in record time. The cyano will die off and feed more cyano. I imagine, if not eliminated, it could possibly overtake your tank and polyps and kill them. Cyano LOVES DOC (critter waste/decaying food/die-off). Once you eliminate that, or significantly reduce it, you will not have the problem.
Can you siphon it out of your fuge? I am thinking, since you light your fuge 24/7, this is also contributing to your problem. It might even wipe out your algae, in there, eventually.
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Old 08-16-2006, 02:16 PM   #3
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I'm not lighting the fuge 24/7 any more - its helped stabilize PH through the day.

My DOC is, I believe, under control - my tapwater has 0.5ppm phosphates, which is probably more than enough to feed cyano. That's why I'm looking at RODI.
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Old 08-16-2006, 03:23 PM   #4
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Hmmm.....
I read an article ther other day. Unless I read it incorrectly, it is the DOC that the cyano thrives off of, that's part of why the phosphate reading is generally low. Someone please correct me if I am wrong.
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Old 08-16-2006, 08:55 PM   #5
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0.5 is enough to feed it. RO/DI will be good for you. Also how often are you feeding?
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Old 08-17-2006, 03:19 PM   #6
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I alternate between once and twice a day. My parrotfish is pretty big, and when he gets too hungry he starts eating my LR, and occasionally knocking things over, so I like to keep him fed.

They always clear out everything I feed them in short order.


Remember, I'm running without filtration, with 85lb of LR in a 75g tank and 10pounds of rubble in my sump/fuge - with zero ammonia, nitrite, nitrate. Overfeeding would be a real problem pretty fast.
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Old 08-17-2006, 04:22 PM   #7
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IMO, .1+ PO4 is high. Try topping off with RO water
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Old 08-17-2006, 05:38 PM   #8
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Quote:
I alternate between once and twice a day.
I can't find any feeding reqs on parrot fish, but that might be the cause. 1-2 times a day is a lot of excess nutrients in the tank.

Quote:
when he gets too hungry he starts eating my LR
They tend to munch coral. In fact, if you snorkle or SCUBA near them, you can hear them munching. I actually got bit by one. I beleive they do that to eat and file down their "beaks".
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Old 08-17-2006, 07:13 PM   #9
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You need to cut back to every other day as 1 or 2 times a day is your problem
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Old 08-21-2006, 02:29 PM   #10
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Okay - so feeding every other day - what about all the documentation (the thick little book by the Michael guy from Lincoln), that say feed 3-4 times daily for almost every fish I have? My Yellow Tang always seems right on the edge of breaking down with HLLE (he's improved much since I found a source of nori), so I'm giving him nori almost every day. If I cut back on feeding, aren't I taking a chance of providing him even less nutrition, and bring on a bad case?

Virtually no food goes uneaten - so the feeding cutback you're suggesting is to cut down on waste products, right?

Re: the parrotfish: he hasn't bothered any of my softies - shrooms, GSP's, zoo's or xenia's. I don't have any hard corals, those are a potential snack for the parrotfish. He seems to prefer nibbling on the LR itself.
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Custom acrylic sump from GlassCages.com
2xPCX-40 return pumps
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No-name 36W UV
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