I had extremely cloudy water even though my ammonia levels were perfectly zero and my carbonate hardness, ph, nitrate and nitrite levels were well within the acceptable range. So, the cloudiness was caused my a simple bacteria bloom that was turning my pristine and beautiful underwater forest of Java ferns into the fish equivalent of silent hill. I was performing daily 20% water changes, reducing feeding, turning off the light for days at a time but nothing worked. So I caved and bought this UV filter, because the price was good and the reviews said that within 3 days their water was clear. So I put the filter in last night at around 10 pm, went to bed later that night, and when I awoke the next morning at 10am, the water was crystal clear as shown in the pictures. So within 12 hours my 20 gallon tank went from silent hill to crystal clear.
I'm not going to keep it in there as a full time filter, but if that bacteria tries anything funny again, I'm going to bring down on them the UV filter of doom.
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