Plagued by green water...

[Mudfrog]

owain is refering to a scrubber not scraper. Scrubber uses a screen and light to build a layer of algae to consume nitrate.

Ok, my bad. I thought he meant a scrapper.

 

[fishman09]

Could the tint be from the duckweed working as a green screen casting green light down? Maybe try removing the duckweed?

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