I am about to install an in line uv sterilization unit on my 120g tank to solve a bacteria problem that I have been having in my tank. I plan on running it on the lowest setting for parasites. This means I must divert 2/3 of my water flow around the UV sterilization unit. Is this a problem? My system is drilled to only turn the tank over 5 times an hour and can't be drilled any bigger to maintain the structural integrity of the tank. As a result I am also running an aquaclear 110 HOB. My question is should I be running another UV unit on the line that diverts excess Gph around the uv unit? I could run a second unit on a higher nonparasidic setting that will still kill the bacteria. The redox potential of my water is extremely high and is letting columarius breed out of control despite pristine water. I bleached one tank and 3 days later it was filled with winter wonderland columarius in that same tank.