I have a couple of prop tanks from which I will be removing the DSBs to allow for more flow and easy cleaning. The DSB is the only form of biological filtration, and Im searching for something to take its place. I would rather not go with the conventional bio wheel/ball method, and have been thinking about a fluidized bed filter. Having never used one in the past Im curious as to whether they work or not, and any pros and cons of using one. Are there any specific brands or models that work best? Any other suggestions welcome. I would fill the tanks with LR, but the tanks are very shallow and I don want to give up any realestate TIA