A club member of mine has a setup similar to what you just mentioned. He has 2 6100s on one end pointed to the middle, and a new VorTech pump on the other end aimed to the middle. The VorTech pump is the one that is a 2 part pump, with the impellor in the tank and the motor on the outside of the tank. He has this in a 6' 280 gallon tank.