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Old 03-23-2004, 01:17 PM   #1
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Algae on sand. Corraline?

Hi all,

My tank's been up and running for about three months now. I have gone through the brown algae stage, it's pretty much gone. Now, I have some green hairlike algae on some areas of the LR which I don't mind at all, it actually looks cool. I've got some macro in there, and I am starting to get good corraline growth on the LR as well.

However, I am also starting to get what looks like corraline growth on some areas of the sand. I haven't heard of this happening before. It's almost like it's crawling off the rock onto the sand, weird. It's kind of like a blanket of reddish purple or bluish black algae with airbubbles trapped under it. Is this normal? Yes, I am using tap water. Anything else I should think about, besides an RO unit? That is a LAST resort for me.
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Old 03-23-2004, 01:36 PM   #2
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It might be cyno bacteria.. you will have to wait till some of the experts chime in.

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Old 03-23-2004, 01:49 PM   #3
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Forgot to mention:

I am running Phosguard. I have loads of snails, some shrimp, a small hermit and a brittle star, but nobody seems to want to touch this stuff.
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Old 03-23-2004, 01:59 PM   #4
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It really does sound like cyano.. What are your parameters? PO4 especially?

Andrew
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Old 03-23-2004, 02:49 PM   #5
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Yep...I'd say the same thing. I would guess you have some phosphates in there. If its cyno, it is a thin slime, right? Nothing is going to eat it, so its pretty much just a matter of water changes and phosphate sponges.

Oh...the "cool" hair algae will eventually take over the tank if its not brought under control. Its usually due to excessive Nitrates. Might want to check for those as well.
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Old 03-23-2004, 02:56 PM   #6
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Thanks, last I checked Nitrates were zero, but I'll check for everything tonight.
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Old 03-23-2004, 03:40 PM   #7
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Silicates can also cause hair algae. What kind of sand are you using?
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Old 03-23-2004, 03:52 PM   #8
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I'm using Old Castle (silicate free) playsand. About 4" deep.

After doing some research, I think it is definitely Cyano. Is there anything besides RO water that will help? On that note...

Anyone recommend a good RO unit? I really don't want to get one, but I think I might have to since I don't have anywhere nearby to purchase RO water. When an RO unit is installed (under a bathroom sink for example), how does it drain? Also, where do you guys collect the water? One reason I don't want to get one is my wife isn't going to like having a 25 gallon trash can full of water in the guest bathroom. 8O
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Old 03-23-2004, 04:02 PM   #9
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why not attatch it to the plumbing in the laundry room? And dont forget, you can always route the hose from the R/O unit into a closet or something. It doesnt have to be visible.

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Old 03-23-2004, 04:10 PM   #10
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Good idea, but the laundry room is in the basement, the tank is not. I don't really want to lug water up and down the stairs. Also, there is no sink, just incoming water supply to the washer. Doesn't the RO unit need to drain somehow?
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