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Yes, I think you're right. It appears to be just stalked diatoms on hair algae. The algae is pretty brown, but under the cheap scope there's a few green spots within the walls. No fish in my system currently and nutrients are pretty low so although it grew I think it's days are numbered and why it appears brown rather than green. I checked nutrients again today and I'm at no3 2.5 and po4 .01. I gave a few spots a squirt of peroxide and those spots cleaned right up. I'll probably just keep hitting it directly until it's gone since I dose peroxide daily anyway.Although there are some very weird cyano in the world that do some stuff like that, the simplest explanation is diatoms covering filamentous algae.
like this...
diatoms on strands of derbesia and cyano
(do google image search for epiphyte diatom for more similar things)