Chondria repens algae or similar

[RyanN]

Has anyone had this algae show up after the other macroalgae fades off? Does anyone know anything that would eat it? Snails, hermits and emerald crabs won't touch it. I'm about to go nuclear and bleach or dry the rock out. If you see this on a rock immediately remove the algae or rock. It spreads slow but nothing kills it. I've tried kalk and hydrogen peroxide. Hydrogen peroxide literally did nothing.