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How long do you let it grow before it's like that? Mine does that if I let it go a week without cleaning. It's pretty common to have to clean it once every 2 or 3 days
coraline algae, pretty common on my glass too if I don't clean for a while.
Looks purple in the pic.....it's dark green in person?!?
(Coraline does come in lots of colors, but dark green is an unusual one. Light green is only slightly common. Purples and pinks, like you mentioned, are definitely the main ones you'll see around.)
BTW how much light is on this tank? How long are the lights on? What are NO3 and PO4 levels like? What do you feed the tank and how often?
BTW, are the srands "crispy" like the coraline algae, or is it another "soft algae" (like maybe hair algae or something like that) growing on/with the coraline? Can you turn off the flow, turn off the blue lights and turn on the whites and get a closeup of the strands?
Do you have a microscope? I'd love to see scope pics all of this.
A toy scope will work as a minimum....many of us on here have the one Amscope markets for <$20.
You don't have to spend more than $50 to get a much nicer one if you think you want to be more serious about it.....but <$20 is an easy start. (Other makers also market the same toy scope, so shopping around may be worth it.)
Check out Selecting a microscope for lots of details....