Some kind of algea i think

Yep since its so localized, just point a powerhead at it if you can and it will break up. You'll want to see what your nitrates are like to see if that's causing it to bloom like that but sometimes it will form on LR that has excess gunk/funk lying on it. If your nitrates are high, some water changes or macro in a fuge will help long term.

In a newer system, this stuff is common and usually goes away after a time.
 
While I agree removing it from the rock is best, I would try to siphon it out instead of letting it scatter and land elsewhere. So using a turkey baster you can blow puffs of water on it to loosen it up and siphon it out.
 
Thanks to all we vacumed or siphened it out of our tank. Were using chemo-clean, I think thats the name of it. I will keep you all posted .
Thanks
Jamie
 
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