Whats growing in my sump?

[jumbostink]

Doing a little maintenance on my tank and I noticed one of the rocks in the sump has a thick jelly/mucus like substance growing on a layer on the top of the rock.

At first in the sump it kinda looked reddish but when I pulled it out it looked almost green. When I set the rock back into the sump the layer floated off the rock and I grabbed it and pulled it out. It now looks almost like a dark purple /greenish color.

I know its hard without pictures but is this something I need to be worried about?

 

[Reef Bullet]

Sounds like cyanobacteria. Aka blue green algae. Not something good but lots of things you can do to make it go bye bye. Google & read up on it...

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[AFUreef]

I agree sounds like cyano..lots of options here and it's not something to be really worried about but definitely take care if it! Google is your friend