A UV can actually tip the scales and make a difference more than you might think as long as it is appropriately sized. You want something as big as possible, 50w or up, anything less might work to clarify the water somewhat but won't be effective as a prophylactic (or whatever the correct term is for this). Ideally one with a wiper to keep the lamp tube as clean as possible and a new lamp (just like a halide or a t5 they lose effectiveness over time).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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