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Old 05-29-2012, 03:56 PM   #1
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'Dusty' mould growing on live rock.

Hi
I set up my first marine tank 3 months ago and now have 3 hermits, two clowns and some live rock. at the weekend I bought some small pieces of live and after a few days there is something growing on it that looks like a greyish green dusty type mould. it was disturbed by a crab and it scattered like dust.
Has anyone got any idea what this could be please
Many thanks.
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Old 05-29-2012, 04:04 PM   #2
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pictures will help identify.
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Old 05-29-2012, 04:41 PM   #3
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Sorry, photo attached. the 'growth' is around and above the mushrooms on the centre piece of rock.
Thanks.
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Old 05-29-2012, 04:57 PM   #4
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Looks like cyano to me. But I am no expert. Perhaps others will chime in.
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Old 05-29-2012, 06:53 PM   #5
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Originally Posted by spoonman
Looks like cyano to me. But I am no expert. Perhaps others will chime in.
+1. Looks like Cyano to me too!
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Old 05-29-2012, 07:44 PM   #6
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That is def cyano.
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Old 05-30-2012, 02:58 AM   #7
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Looks like Cyano or turf algae. If it comes off with a finger tip it's cyano. If it's stuck really good on the rock, then turf algae.

Either way, you can lower your feeding schedule/amount and siphon it off with a good scrub.
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Old 05-30-2012, 04:21 AM   #8
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I must be looking at something different but Ive not seen cyano like that. Do you have good water movement?
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Old 05-31-2012, 02:50 PM   #9
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yes, I have good water movement. I have searched the internet for pics of cyano and have not come across any like this. It doesnt just come off with fingertips, it acts like a dust or powder.
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Old 05-31-2012, 02:56 PM   #10
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I'd say it's diatris . Cyano is obvious when you see it
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