Agree with the above. I have two MP40's in my tank, one on either end and I need more flow in the back and at the bottom. I would like to stick with Vortechs, but I cant angle them where I want them. Also, what size tank is it? The MP10 is limits in glass thickness. I had planned on a MP10 on the backside of my tank but the glass is too thick and I did not want an MP40 on the back. So Im in the same boat. Ill go either a 3rd MP40 on the bottom rear of the right side pane or will add a Tunze. I just hate mixing pumps in one tank.
Have used both brands and you cant go wrong either way IMO