What is this and how do I get rid of it?

JojosReef

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#4
could be a type of filamentous algae growing between the coraline and on top of the film algae. Doesn't really look like hydroids from what I can tell. What surface is it on? It looks flat. Is it glass? If so, you could just scrape it all off and suck it up.

An urchin would probably clean all of it (coraline included).
 

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