Originally posted by ffishermen
would having two power heads blowing in two directions at the same time get the same results?
Yes and no. It will create smaller random currents right at the spot of intesection, and they will tape in intensity as they travel further from the source. What you will end up with is one very turbulent spot in your tank(right where the currents colide). For the most part your corals will have a pretty steady flow, and only the corals closest to the currents colision will notice random currents.