So a couple of days after I installed the UV sterilizer my ammonia and Nitrite went up, Nitrate much more than Ammonia. I noticed that the water flow went significantly down when I installed the UV. I turned off the sterilizer but kept it connected to my system. The numbers went back sown within 2 days. I will probably turn the UV on again in a couple of months to see what happens. On the bright side I just set up my 10 gallon observation tank and since my clowns and firefish seem happy I am going to pick up another fish tomorrow, can't wait