ID on algae please

[peewee5779]

I would like to get an ID on this algae. It only grows on rocks or dead parts of coral. It grows in a clump formation. I would also like to know what kind of shrimp/crab etc would eat it?

 

[shakacuz]

seems like turf algae, or just thick patches of GHA. urchin(pincushion/tuxedo) can help. some hermits/snails can help with this but ultimately its just getting your no3/po4 in check or having some macro algae to compete for growth/nutrients(if you have a sump)