If this were out of the water, I'd say it was a Myxomycete or something along those lined. Never seen orange algae and it came off easily.
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If it is a sponge and that texture to me would say it is. It should be back.Now I'm kinda sorry I scraped it off.
It fragmented into a powdery type particulate matter, not unlike magic sand.
I suspect it may return.
Did you ever figure out what this was? I think I have some in my tankNow I'm kinda sorry I scraped it off.
It fragmented into a powdery type particulate matter, not unlike magic sand.
I suspect it may return.

