Right now I am debating either between the Seachem Tidal 75 or the Marineland Emperor 400. The tidal 75 sounds nice because of the surface skimming, adjustable flow rate , and self cleaning impeller and because the matrix reduces nitrates. The emperor 400 sounds like a good option because of the two bio-wheels and filter pads and cartridges for other media. I was thinking about getting the emperor and putting matrix in the spaces and carbon in the cartridges, does this sound like a good idea? Would love if someone could help point me in the right direction.