OK, Idea... I'm wanting to one day have a 150 gal tank or larger one day... I love the look of a clean tank with as few things inside as possible. Going with a sump, one can put heater inside of sump and minimize in-tank obstructions. What about sponge filters? I think they're ugly and was wondering if the consensus is that they aren't necessary with sump filtration. Could an in sump sponge filter be effective? Thoughts?