I was under the impression that a full length spray bar gives you uniform flow along the full lenth of the aquarium. I have presently got a 1m long spray bar with 3mm holes placed 1.5 inches apart, centrally placed in a 4ft aquarium, powered by an fx5. What I am finding is that the velocity of flow is far higher at the furthest end than the nearest. I assumed that the velocity would equalise along the spray bar. This seems to bring into question the value of a full lenth spray bar from one powerfull input. I have done a few searches and can't find any discussion on this. Any thoughts. cheers