ID weird hard substance

[Janka]

This stuff is growing on two of my rocks and its pretty difficult to remove. Its hard and smooth.

Any thoughts?

 

[PSU4ME]

PM John at reefcleaners - he is good at this stuff. That is unless someone else can give it a +id

 

[Reefmack]

Might be a type of Lobophora:

Melevsreef.com - Lobophora

 

[Janka]

It sure looks a lot like that, but mine is a bit darker. Now let the research begin!

 

[GrendelPrime]

looks alot like scroll algae

 

[mbdave]

Terry (Reefmack) is right on the ID that stuff ranges in color from browns to red it's somewhat common I had had it several times over the years I wouls peel it off if it bothered me.
Good luck,
Dave

 

[Janka]

It's on 4 of my rocks. It ranges from a dime size to that big spot which is now about 3/4 the size of a dollar bill. Any east way to remove besides taking the rock out? That's my foundation rock, so its a toughy. Maybe chop off some of my GSP and stick it on top of it? Watch it disappear ^.~

Edit: I have been pulling off as much as I can during water changes. Thoughts on some type of urchin? Been reading that some urchins do eat it, a hit and miss thing.