Aquaponics & S/H?

[harpspiel]

I've been seeing some beautiful setups on the internet that involve plants growing out of the tops of fish tanks. Would this be possible to do with orchids, maybe with pots of hydroton that are submerged an inch or two into the tank?

I currently have a paludarium that is mostly dedicated to orchids, and I'm percolating an idea for an exposed, indoor drip wall that drains into a fish tank, with a cool rock formation and lots of lithophytes up top, and maybe a few orchids in S/H right near the tank. Something like this + this.

Part of my reasoning is that I'm great at building things and tinkering, and good at growing orchids inside a tank, but much less good at consistent watering by hand. Plus, of course, I think it would look great and would add some humidity to my extremely dry high desert air (I'm sure I would have to top off the aquarium water or the reservoir more than once a week). I would also love to grow a few Phrags and an Angraecum sesquipedale, which I've heard do well in S/H. I'm assuming that I would have to supplement the fertilizer from the fish with a fish-safe plant fertilizer.