Add PO4 or a 3 day blackout seems to work. I'm still experimenting on various ways to remove different types of algae. For the greenwater a 3-4 day blackout worked for me and also got rid of my green spot algae. The only plants harmed were ones that had weak leaves. The plants recovered but the leaves had to be prunes. Mostly dwarf sag. Some Rotala Indica.
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Member of the AGA (Aquatic Gardner's Association)
Member of the IBC (International Betta Congress)
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