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Aquarium Green Water

We have green water. No algae on anything, just in water. Tank is near front windows. Have tried to leave the lights off and am using two external filters. They don't remove it. I thought we need to use a UV sterilizer. What is your solution?

We have green water. No algae on anything, just in water. Tank is near front windows. Have tried to leave the lights off and am using two external filters. They don't remove it. I thought we need to use a UV sterilizer. What is your solution?

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