I was going to PM as you don't accept emails from the link, but then I figured we aren't into anything that might not help someone else in the future, so I posted instead. Also, maybe someone else will have an idea.
I don't have a diagram, but I can describe it to you to see if you think it will help.
The living room is the lower level of a split level room. In the living room we have a 225 gallon tank that we are about to setup up as a reef display. Under that tank we have a sump/refugium. The return pump to the main tank is a Gen-X mak-4.
The upper level of the room is the dining room. We were planning on having a 50-75 gallon tank there with sea grass or similar and seahorse. The 225 is drilled with a hole at the top rear center. This was to be connected to the drain of the seahorse tank.
Our skimmer is an H&S 200 2x1260(2 Eheim 1260 pumps). We would then pump from the sump beneath the 225 up to the second level. The 2 tanks would be back to back, though the seahorse tank will be about the main display.
If you have any questions let me know. I can draw something if you can't picture it, though I am totally inept in drawing. If you need a picture, send me your email. When I went to your profile it said you did not accept emails.
Thanks for the help
Drew