Dark red growths on rocks

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I have recently noticed some dark red growths on two of my rocks in my marine tank.
The rocks are Caribsea life rocks not live rocks. I do have quite a few soft corals that did come attached to small pieces of live rock.
I am adding photos of them.
Can anybody  confirm is they are a good thing to have in a marine aquarium I would appreciate it.
Dave

Amo Manik

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Reply #1

Can you get a clearer pic as can't make anything out?

ajm83

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Reply #2

possibly cyano but need better pics to confirm 🙂
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davlyn666

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Reply #3

Thank you for your reply. I have attached more images I hope the are clearer.
I do not have a very good camera though.
Thank you Dave

ajm83

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Reply #4

Could be a few things but I still think cyano is the most likely.  Next time you do a water change, see if you can syphon it out. 
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davlyn666

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Reply #5

Thank you for your reply.
I have taken some photos but I do not have a very good camera.
I hope they are better than the others.
Thank you Dave

Ratvan

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Reply #6

Is it firm and spongy?

mightyhatter

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Reply #7

Another vote for cyano

davlyn666

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Reply #8

Thank you for your reply. I would say if feels more soft and spongy. do you think i should try and clean it of the 2 rocks  or just leave it.
Thank you
Dave

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