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Old 12-12-2012, 09:35 PM   #1
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brown algae

I have a thin layer of what looks like brown algae growing in my tank, its on the rocks and will accumulate on any rough surface that has a reasonable amount of flow on it. I thought it was cyano but its really not red and there is plenty of flow in the tank so I think that might be in incorrect diagnosis.


Tank is 37 gal and i do a 5g water change once a week lights are on for ~10h a day. i would test for trates and phosphates, but i have a feeling tha the agae is just using it up so that wont really help. I use rodi. I've been running chemipure elite for a week now with no results.

The reason I'm posting a thread is becasue i cant seem to find any info on any type of brow algae that isnt diatoms or cyano. see attached pics






thanks for any info you guys can provide
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Old 12-12-2012, 10:25 PM   #2
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I'm not really seeing any brown but i do see purple/pink stuff. Is that what your talking about?

Maybe this link can help Nuisance Algae ID Guide
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Old 12-13-2012, 01:13 AM   #3
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Not the coralline, it's hard to see but just to the left the the sea whip there are like little brown hairs
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Old 12-13-2012, 02:52 AM   #4
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they are red slime algae, or call cyanobacteria.
It usually cause by too much feeding with left over, and also could be too long of lighting that is in green/yellow spectrum
or
you have high level of nitrate/phosphate.
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Old 12-13-2012, 09:26 AM   #5
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Brush it off with a toothbrush it's not red slime. A hector goby or a herbivore wrasse or such will enjoy it. Keep up with maint. brushing it off glass etc. it will go away don't overfeed
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