What is this black bristly stuff

SO I checked it out, here are some things that eat it.

elysia viridis, Placida dendritica and Limapontia capitata "My experience with Bryopsis feeders, however, in lab experiments is that they consume the alga so fast that it is difficult to supply them with adequate food so they would soon starve to death." Via seaslugforum.net

sea hares are reported to eat it but it is not their main diet
as well here is another post from maast.org

lhoy..
Well if the pic i posted is indeed Bryopsis i HAD an infestation untill i got the ugliest Sea Hare id ever seen!! along with a lawnmower blenny PROPS to Ed @ Wolfreef!!! My Tank looked like a JUNGLE it was everywhere the walls the corals even in the SAND i wanted to just :cry CRY! It was that BAD and in 5 days it went from these before pics that were taken 3 days into the chow down to the after pics taken today! the Sea hare and LM Blenny chomped down on everything in their path cause everything is GONE.. i had Cyano/diatoms/and TONS of that green algae.. They are NON-STOP... just not sure what they will feed on once everything is gone??? :unsure
Let me know where you're located and maybe i can ship him to you??
but after hes done in this tank and in my other tank im putting him into!!
I have a lawnmower blenny but he isn't eating fast enough. I will try some of the others though thanks
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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