Looks nice. I'm a big fan of moss balls so I love seeing other people use them, you've got a long tank there which is good, and I'm really digging the little shelf kind of situations..what are those? I've been wanting to rig something up in my big tank.
I had originally read 120 gallon as 120 L and was wondering if you were getting a second tank if you planned on having 5, but that's nice and roomy for that number axies, although I don't envy you the water changes.