You may also want to look into the Hydor Koralias. I like them much better than the Maxijets, and they aren't much more expensive. With a tank that size, I'd get 2 Koralia-2s at a minimum. The 3s would no doubt work out just fine as well, but I'd probably get a 3rd or 4th Korlaia-2 if you need more flow and position them in opposite corners.