I did alot of research and am going with 2 Eheim 2250's and possibly a fluidized bed. Turns out the wet/drys don't work as well on the fresh. Salt is another story as the dissolved O2 is lower and it is better to get the air/surface contact. There's plenty of O2 in freshwater and with 15 liters of substrate IN EACH filter, there will be plenty of bio and mechanical filtration. Plus I won't have to worry about the overflow noise, pump noise, pump heat, plumbing, spills etc. Thanks alot for all the advice!