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Old 12-01-2008, 10:32 PM   #1
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Question Brown/black stuff taking over... please help

Hello,

I have a 120 gallon tank with fish, live rock and sand, currently I have 12 fish, 2 shrimp, and an emerald crab along with about 110 lbs of live rock. For filtration I have a 55 gallon refugium. My old refugium broke a few weeks ago and I had to replace a few of the panels so it was out of commison for about a week as I repaired it.

A week later I now have this brownish/black stuff growing everywhere. It started on the water jet and has moved onto a rock, the glass and is quickly covering the sand. I have included a few pictures... any advice on what it is and what I should do would greatly help!!!!

I am fairly new to the saltwater world only haveing my setup for a few months now. I bought the entire setup, tank, rock, fish, and refugium already setup and running. I have been doing water changes and I have a protein skimmer running.

Hope you can tell what I have from these photos.





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Old 12-01-2008, 10:42 PM   #2
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Cyano . It is a bacteria
Reduce lighting ,lighten your feedings , if using frozen try to rinse it before giving it . siphon off where you can and increase your H20 changes to a couple largish changes , 50% for a couple weeks , you should start to see it dying off due to the removal of excess nutrients ect
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Old 12-01-2008, 10:43 PM   #3
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please post your water readings including phosphates if you have the test kit.
How often and what do you feed your fish?
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Old 12-02-2008, 09:35 PM   #4
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I agree with Sadie as far as siphoning it off. Get as much out the tank as possible.
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Old 12-02-2008, 09:47 PM   #5
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thanks!!

Thank all of you for your help!

I will do a major water change this week and reduce the amount I feed (I am an admitted over feeder). I will also remove all of the growth from the tank as I can when I do the water change.

It was suggested that I reduce the lighting, do you mean the time the lights are on or the the amount of light?

Thanks again for the help!

Terry
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Old 12-02-2008, 09:51 PM   #6
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The amount of time.
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Old 12-02-2008, 09:55 PM   #7
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Ok, thanks. I run my lights on average about 14 hours per day on a timer. Then at night I have moonlights that come on when the others go off.

Any suggestions about how long I should have the lights on?
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Old 12-02-2008, 10:14 PM   #8
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I would change it to 8 hrs a day. 14 is too much.
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Old 12-02-2008, 10:20 PM   #9
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Yeah i normally run mine for 7 hours or less... By the way are you using RO/DI water? for your water changes?
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Old 12-02-2008, 10:33 PM   #10
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Thanks, I will change my light timers.

I use RO water.
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