After receiving reassurance that my plan to install my new Coralife Turbo Twist 3X was on track, I set out to install it. New 5/8" ID clear hose - fine. Slight modification of my powerhead for hose - fine. Whoops! No cannister filter! I'm using Hagen's Aquaclear hang-on-the back filters - dang!!! I don't see how this sterilzer can work because the water coming into the sterilizer must be fed from the filter. How can a hang-on-the back filter do that? Please tell me that I don't have to get rid of the Aquaclear and purchase a cannister filter. One last time - HELP!!!:sad: P.S. If a cannister filter is a must, please give your opinion as to your favorite for a 55-gallon FW that's simple to use and economical, etc. Thank you:bowing: