I bought a CF-500UV about 2-3 weeks ago and it is my first staged filter. I had the Magnum 350 but that's a single element. My question is how long do you normally let it run initially before opening it up to maintain the very first time? I already had 2 Aquaclear 70s that were established so this was an add on. It is currently setup with a course filter and Active carbon in first tray, 2nd tray is more active carbon (I am clearing a new driftwood that was tanning), 3rd tray is Biomax, and 4th tray is 2 polishing pads. Any input would be appreciated. Thanks