Saint, my tank is rr, I would like to put two Emporer 400's in it, but the edge of the overflow boxes are right where the intake of the 400 should go. The tank also has a large glass brace 11 1/2" wide, right in the center, so theres not much room for any meaningful hob. Thats why I want the monster 2260's, lots of filtration media, 1k gph turnover.