Sump Design

[Lofty]

I am building a 20 gal Long Sump. I have got the inlet section nearly done, which will have 9 inches of water (allowing for some rock). I want to do a refugium and I have always built them in the middle, but I am thinking of doing the fuge on the right and the return in the middle. I have a little giant external return pump which I was going to plumb through the DSB of the fuge and out the right side... does this sound like a bad idea; should I stick to the fuge in the middle....I was going to plumb a split in the inlet with a ball valve for adjustment to keep flow down in the fuge... otherwide, there would be constant high flow over the fuge into the return. Thoughts and comments are welcome.... thanks

Dan