30 gal Hex tank

[Fishward]

Hey everyone,
looking for a bit of advice regarding what type of fish might do well in a 30gal hex. I have built a rock wall as a backdrop using about 25 lbs of liverock so there will be a fairly open base of sand. I will be cycling the tank once the concrete in the wall cures. I will have an 8 gal sump with a 500gal/hr return pump.
The setup is very vertical so im looking for fish that don't need a lot of swimming distance. fully expecting to only have 1 or 2 fish in this tank but would like some ideas regarding what will thrive.

thoughts?