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UV will knock out green water and prevent it from coming back. Green killing maching is sold at petsmart, and other places, and has an integrated pump - really nice and convenient feature. It's called the green killing machine for a reason.

Normally I don't like to suggest solutions that don't address the core problem, but at the same time you should know that that will clear your tank. There ARE other debatable benefits to running UV on your tank so it's a multipurpose piece of equipment.
 

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UV is a guarantee.
 

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I know the OP had green water - I thought that you did too. I know there are people who think that UV helps prevent other kinds of algae too, by killing the cells in the water before they can get a foothold somewhere. Admittedly that's not something I've looked into very much.
 

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Green killing machine :)
 
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