question: to much water movment?

[Richard_Dicosimo]

im setting up a 120gal and i ordered all the pumps and thinking back now im a tad worried im going to be blasting my fish out of the tank.
DAN Mag-Drive 1800 gph water pump(closed loop)
DAN Mag-Drive 500 gph Water Pump(return pump)
i have seen on websites how guys have drilled the bottoms of their tanks and had all the return lines from the closed loop hidden under rock and this is what i have planned. im going to have 16 jets shooting water off of the 1800 gal/hr pump. please any input would be nice. the equipent arives middle of next week.