Apistos are an option if you provide good spawning sites. If you don't, the HC may be burrowed under.
Any of the smaller, more delicate rainbow fish are stunning in a tank. Black darter tetras are similar.
A swarm of otos are always nice.
Easier to keep shrimp are great, but keep them away from apistos/rams.
There are plenty of amazing danios (celestial pearl and such) new to the hobby worth checking out.
Pencil fish (coral red, N. trifasciatus)
There's a lot out there if you go digging.