Pruning affected leaves is the best way, though you can try a 1:20 mic of bleach:water. Soak till the algae starts to turn white. DO NOT SOAK THE ROOTS. As for the tank, manually remove all you can, turn over gravel and bury what you cant remove. Then do a large (60-70%) waterchange. DIY CO2 doesn't do much on larger tanks and with 2 HOB filters, you are probably outgasing the co2 you are introducing.
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