Coraline Algae?

Palimow

Reefing newb
Is that what this is? Would I be able to fill the tank with a vinegar solution for a couple days to loosen it up? It's an acrylic tank. I know some chemicals are a big no no for acrylic but I haven't heard anything about vinegar. Just want to make sure before I start.

 
It looks like dried algae to me. I would fill the tank up with water and vinegar let it sit overnight, then scrub it really well. Vinegar is safe on acrylic. I use it to clean. My skimmer all the time.
 
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