I'm trying to figure this out. It will work, I just need to reinforce and level the desk in the basement. Then figure out all the plumbing. It will be somewhat complicated.
First, I have to convert all three 1.5" holes in the 135 to drains. They will drain into the sump. Then my return plumbing will go out the back of the stand, and then to the left to the nanos, and over the top into the 135g. They will drain into the 55g. That will only house the Mag18. The plumbing will go out the back, and have a ball valve on all three exits (135, 20L, 20L). The 135 will receive moderate flow, say 200gph (I can add a PH if necessary). I have around 1300 left then. 800gph to the SPS/clam 20L, 600gph to the clown/anemone 20L. The skimmer will be in the 135g on a PVC stand, separated from the rest of the fuge (eggcrate, yay!). Or should I put the skimmer in the sump? I'd think that would harm more pods than if it were in the fuge, as the fuge drains into the sump. Hmm..
Just the two 20Ls, and the 135g fuge. Sounds simplest. SPS/clam in one, clown/anemone/assorted things (anthelia, zoanthid, LPS or two).