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You have greenwater.
Massive water changes will help the most at first, as mentioned purigen and uv can hold it back too.
Purigen will actually absorb the unicellular algae that is causing the greenwater, but it will need to be recharged or replaced or the algae will return.
Try a multi pronged approach with purigen & water changes. Change 50% to 80% if you have established biological filtration [do not change filter and water together]. Then throw in some purigen.
Change 50% weekly with the purigen and see how it goes.
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