Tangster is trying to steal my thunder and my CORONA! I put a hydor on 2" of lock line coming out of the back left corner. Its a gizmo that spins 3-4 times a minute sending flow in different directions. $15-20. I agree with Tangster and if he reads this and feels I am wrong, Tang please tell me, its my experience its not tons of flow that is good but flow where you need it. Sounds simple but sometimes is hard to achieve given all the LR and stuff we put in our tanks.