Cool find. I never touch the stuff.
Next time you get green water, accelerate their growth. Blast it with light. They'll consumer all the nutrients and die off.
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But wouldn't dying algae provide nutrients for the still surviving algae, which would reproduce, more algae, some dying to feed still surviving?
I hate to admit it but, I've gotten rid of green water several times using flocculents such as SeaChem Clarity. I had to constantly exchange the micropad in the filter but it did work. Fortunately, I didn't lose any fish. Anyway, I learned not to disturb more than a third of the substrate at any one time so, I haven't had green water in years.