What is this?

Devils153

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I have this on two frag plugs that have been in my tank for 7 months. When I touch it it does not move or disintegrate. It almost seems to me to be red coralline. Anyone have an idea. Does not seem to bother the zoa and picture was taken at night after I touched it with a glove on.

E2371DF6-955C-489B-8CA3-F3E405B9C117.jpeg
 
It looks like red coralline algae to me, unless you could get a clearer picture
 

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