Ok I am about to pull the 4 crapy pumps I have in my tank and get one good one. I have been reading and comparing, reading user reviews and so on... many users say the vortech's are incredible but they wish they had just gotten tunze's. So I was hoping maybe someone here who has had both could give me some good comparisons. I don't know which to get...I am just looking for something to add good movement to the middle of my tank.