+1 Solcielo lawrencia
Absolutely correct. Reduce your light immediately, and it as long as your CO2 indicator stays green-ish, up your CO2. That is the very best thing you can do to combat green water.
If you've got the extra money and want to use a UV sterilizer, they work extremely well too. Just make sure your flow rate through the sterilizer is within the recommended gph set by the manufacturer. Too slow and not enough of the water gets sterilized, too fast and the UV radiation doesn't do the job.
The best thing would be to fix the problem in the first place though. Less light and maybe more CO2.
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