I have a 55g corner bow and I have 2 700gph PH and 1 500 gph
PH. And my fish don't have any problems with it being too much current. Since I have 3 sides, I have one 700 on front left side, one 700 on front right side and the 500 on back right side mostly facing up and kinda towards each other. This keeps food and such from settling, but doesn't seem to bother the fish or corals. If yours is a rectangle, I would put them on opposite sides of the tank, facing each other. See if that helps. You'll probably have to mess around with the placement a little to get it right.