Thanks for the suggestions, keep them coming!
Anthony, the jawfish idea is neat since we've been eyeing one for quite some time for our other tanks. Coupled with a upper-to-mid-water schooling fish that would make for a neat tank for sure.
We definately want to do something different than our other tanks, so I'm not too keen on putting corals in there, and we've already got a non-photosyntheic tank in the works (the deepwater tank).
Octopus require a completely sealed tank, so it would not work in this 110 gallon. But yes we'd love to eventually build an octopus tank. Same with the jellyfish, they require special filtration and system setup, like the kreisel. I've built small-scale ones for the seahorse babies but not something in such a large tank!
Keep the ideas coming! We are bound and determined to get a feasable idea for this tank.
-Diana