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GW will hang on forevever, I think you will kill your plants or hurt them pretty good. GW likes CO2 and intense light. Once present, it's tough to get rid of.
Your case sounds typical.

Here's a method that's cheap: use one of those Hagen quick filters and slightly clog it with mulm first, these are 5 micron filters and the GW cells are 2-3 microns so they should all get removed and rinse off the filter and take it out carefully.

Leave this in for a few days after or anytime you see the GW. Add more filtration/established biomedia etc, raise the light up some if possible.
As the tank matures more, plants grow well, this will not be an issue generally.

Regards,
Tom Barr
 

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If you want to experiment, get a UV, easy to use and works easily. The diatoms are okay but you set them up. UV? Flip a switch, kill green water.
80$ will get you a new UV.

You will not beat GW with nutrient dosing. It'll still grow and hang on far beyond the limits to the plants.

Regards,
Tom Barr
 
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