Hello, I have a 125 gallon reef and I had 7 maxi-jet 1200's and I thought I had alot of water movement.
Long story short, I had an experienced reef aquarist come over to my house and he said with the amount of live rock that I had (150-200lbs) my flow was not strong enough.
So now I broke down and bought a Tunze stream kit with controller.
each Tunze pushes 1850 GPH and with the controller they can be set on different programs. This was well worth the investment, there are no dead spots in my tank now and all of the debris seems to make its way out and into the filter system.
What I was told was that you should have flow 20 - 30 times your aquarium size.