What is this ?

I have some also and don't mind it salaris blennie eats it and some angles eat it Naso tang I had ate it really well. It is some sort of macro algae at least the stuff I have after a while it started growing in bushy patches. it has a burgundy look to it and feels kind of like Velvet. My urchin does not eat it either but has picked a piece top wear looks like red Cheeto.

Bill