I'm just wondering what the consensus on what the cause of green water is now a days?

I've heard everything from too much Fe, too much Nitrates, too much NH4, etc. I don't have green water currently, but I did get it a lot when I first got into plants a few years ago. I really struggled back then to cure it.

Just curious as to what people think the cause is.

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Craig Brye
University of Phoenix Online