dont do any water changes!!!.......u would be literally feeding the algae and making it worse.......i dont understand what it would have to do with the oxygen levels....some people, like me, keep the sterilizer running all the time and never have any problems with the oxygen levels, as long as there is breakage at the suface of the water to create the oxygen exchange, there aint any problems concerning that....lighting is also a factor in green water after the phosphate level........its good to cover ur tank and leave the lights off when using a chemical to treat the water, but with a uv, i dont think thats necessary because there so effective.
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