Thanks for all the input so far. Maybe I will keep the pump for a while and slowly ramp up the power to 100%. Hahn, do you mean just taking off the plastic part to get to the impeller? If so, where would I go about finding that part. I should probably give everybody an idea for what I have flow wise: mag 12 return, hk#2 on the left, and tunze 6100 on the right. The hk#2 and tunze are pointed almost directly at each other. I still have a hk#4 that I am debating about putting on the back of the tank kind of just to the right of the center of the tank. Does everyone point their tunze pumps across the tank lengthwise, or do you try to bounce the flow off the tank walls? Dominga, I will be starting a coed session in 2 weeks to get warmed up for my mens team that we usually do in the spring so maybe I will see you on the field. BTW, when do meetings take place? I am always up for learning new things.