Greenest Water In The World

You see another way of looking at things is this:

The green water in your tank is an indication that there is something not quite right, a visual feedback that you can guage against. Adding UV sterilizer will take this visual feedback away. However, I do not think there is something inherently 'wrong' (<-read dangerous for your fish / plants) with your tank, just an imbalance somewhere (e.g. too much lighting, not enough plants, blah blah blah).

Now if 'getting the balance right' does not matter to you then so be it: Great, stick a UV in & move on to enjoying your fish.

Andy. @work, bored with designing a Hand Held PC (aka: PDA).
 

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