Looks a bit like chondria to me . Check this link
Chondria
These and related species look like translucent red plants with cylindrical and irregular branching. They may stick to the rocks like
Chondria repens, or they can brachout like the bushier
Chondria minutula. The important thing in identification is look how the "branches" have smaller branchlets, usually ending in a pit.
Manual Removal - Fairly easy. While macros that have fragile runners and creep along the rock are the hardest to manually remove, this macro tends to peel better than most. Get the holdfast and attempt to peel it off the infected surface, if you miss any go back and polish it off with the tweezers or a dental pick.
Clean Up Crew - Just manually remove. If it is a too much of it, then emerald crabs, larger hermits, urchins, sea hares, turbos and other cleaning crew members with significant cutting power.