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This has never been a thing that concerns me but it is more of a curiosity. My tank never got purple coraline algae (just a tiny bit on my main rock from lfs) but all my dry rock in my tank is covered in a dark green algae and I've heard of coraline being green. I'm wondering if this is the case? The green looks really nice during the day and is only noticable with white light when the lights are off. Any ideas what this is?