I was using coco and getting a little green agae once in a while, treated with h2o2 and it went away. Does your air flow around the pots seem to be sufficient? I'm guessing here, but I had a lot of air flowing around my pots which might have dried the outside up immediately not giving much chance to form algae..?? There was a little green, but mostly the white chalky dust of the dried nutrients that I'd flush out with clean water once in a while. I'd immediately start nutes again after I rinsed. Like I said, just a guess.
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