Does anyone have one of these filters? The manufacturer said that it only needs to be broken down and completely cleaned every 6 months. We have an 84 gallon tank that is NOT overstocked. We have had the tank up and running for 3 months now. This last weekend we did remove the white filter and replace it with a carbon because we wanted to remove the remainder of medication that was in our tank. We plan on removing the carbon filter in about 3 weeks. Any recommendations?