Need Help With Unknown Alage on Live Rock

[da_tahoe]

I need help identifying these algae that is growing over one of my live rocks and starting to kill some of my coral. It's a tough leather-like algae. I pulled some off but it is too difficult to peel it all away. Not sure what it could be but it is continuing to grow. Any help would be appreciated. I hate to get rid of the rock but I'm not sure what else I could do. I have other corals that are growing on it.

 

[Scrubber_steve]

some pics under white light may make it more easy to identify?

 

[mcgyvr]

Yes please turn the blue channel off or way down.. All that blue ruins proper color rendition and typically causes cameras to not focus well..

 

[da_tahoe]

I hope these pics help

 

[da_tahoe]

Here is the other pic

 

[mcgyvr]

Much better..
Looks like it might be a type of encrusting sponge..

Besides manual removal I've heard of some luck with Pencil urchins and even spot vinegar injections..