Need help identifying this brown spotted algae. It's tough to scrape off like coraline, but only grows on plastic as seen in the pic of my hydroponic tub/frag tank. It also grows on clear acrylic frag racks.
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I have it to in my acrylic frag tank and all you can do is scrape it off.
I had my nutrients for more than a month on 0.0 of course no corals in there but it still kept growing.
With a every other day scrape it will come off pretty easy.
Now I have a glass 60 g cube tank on the same system and it won't grow on there.

