I am going to be setting up a 55 gallon aquarium nothing alive except fish I'm going to run 2 fluval 306 filters. They have the 3 baskets bottom foam, mid biomax, top fine pad and carbon. My 2 questions are 1. the biomax in them seems low in basket can I add more and 2. I like the idea of some carbon helping clarity of water but was thinking of having 1 filter with no carbon an just having bottom basket foam mid and top with biomax and the second filter the standard setup is this ok or something you can't do. Also sorry if you have anyothet ideas please let me know. I'm kinda set on the fluval filter but ideas with the media appreciated. Fish will be smaller community fish not a fan of large fish.