nice work with the scaping, good idea to work on a template like that so you know it will fit the tank.
If you are using biorock i would suggest dosing the tank with some bacterial sollutions while you cycle it and i would let it cycle a long time so that the biologicaql filtration has enough time to establish and expand enough to maintain the tank. even though thats a small tank, with a planned light bioload you will need good biological filtration to overcome the lack of mechanical filtration in that tank.
another thing to think about with tank mates is that its an open tank, so fish that are inclined to jump are best avoided.
id suggest a display of some zoas, perhaps a few ricordia (if that lights strong enough) with a group of thor ambioensis and perhaps a pom pom crab.