Interesting what you have planned. I have the 100.3 as well. I know you are going for sps and high flow and the two mp 40s. I only use one mp40 and ramped up it will rock the water (right out of the tank). The two though will help alternate the current, and you probably would do this anyway, but I would suggest starting low speed and gradually ramping them up. The bare bottom is probably a good way to go for you since those two pumps turned up much would definitely stir up any bottom substrate.