Are you decided on rift lake cichlids? I ask because this is posted in the general cichlid section. Given your tank dimensions,plants and that great tall piece of driftwood, it sounds like a great setup for a planted SA tank.Some moss on that dw would look awesome!!
My first thought was a pair of dwarf cichlids( Laetacara's or Apisto's), a group of schooling fish( tetra of some sort), and a group of say habrosus cories(mine use the whole tank). A bristnose pleco could work in there and if the cichlids don't take the snails( they probably will unless the snails are too big) add a couple of assassin snails.
Just a thought.~FNC~
I posted in the general section b/c I wasn't sure exactly which ones would work best for this tank. I didn't want to limit my options/audience. Of course, I had my mind on the labs though! The tank was planted, with the compressed co2 and all that, but this shape doesn't lend itself well to that type of setup either. It's a serious mess with tons of upkeep. My 15 long is much better suited for that, and is spilling out over the top with greenery. In this tall tank, I hoped to have a peaceful, schooling species... they just hid, all the time. Once I mixed up the nets and 'contaminated' the larger tank withe the snails, I began the process of moving fish over to just take the thing down. A colorful, fun species that was at home with the much easier to maintenance rock/wood landscape would be enough to keep this guy up for another few years.
In the 15 long, I put in 2 assassin snails... not a dent. I feed the shrimp sparingly, but the plant matter, and difficulty vacuuming the substrate means theres always ample food for the snails to munch on.
This is interesting though, Laetacara's or Apisto's get along with tetras?
That last paragraph has a lot to think about.