This is my current plumbing sketch. Basically, I moved ferts, H20 refill, and co2 downstream of the filter intakes. I then moved the UV over to the filter return line.
The max flowrate for the UV is 450 gph, and the flowrate of the eheims is stated at 270 gph each, 2x270 = 540....but with the filters full of media, and then all this plumbing, I'm gonna say the flow rate through the UV will be less than 450 gph.
This is what I'm going to go with, but if when it's all put together, the MD 7 is just WAY to much flow, I'll probably try to trade it out for an MD 5(45w instead of 70w for a savings of $13/year