I've got two Koralia 4s on either end, and a couple of Maxijet 1200s in the middle and it's finally where I like it in my 75g. I'm considering replacing the 2 Maxijets with a single Koralia 3 or maybe a couple 2s. With only the two 4s, I found I have great crossflow and side turbulence, but due to the tank layout I find the middle tends to get less flow. I am keeping several SPS and a handful of LPS and softies.