I would suggest an all Malawi cichlid tank. There is a tank, of similar water volume, here in George, South Africa, and this guy has numerous mbuna and others that live as if they were in the Lake. Absolutely stunning to see. Actually rather mesmerising!
Glass, walls at the back and sides, is 3cm thick.
What is the depth and width of your tank?
The list of Malawi's for this size tank is endless.
Pseudtropheus Elongatus mpanga; Pseudotropheus crabro; Pseudotropheus elongatus "chewere; Nimbochromis livinstonii; Pseudotropheus acei; Melanochromis maingano; Melanochromis auratus; Metriaclima aurora; Metriaclima callainos; Labidochromis caeruleus; Cyrtocara moorii; Labeotropheus fuelleborni; Cynotilapia species;Metriaclima hajomaylandia; Metriaclima Barlowi; Metriaclima estherae; Pseudotropheus socolofi; Melanochromis chipokae; Pseudotropheus saulosi; Metriaclima lombardoi; Pseudotropheus heteropictus; Tropheops yellow cheek.
But to name a few. I have all the above but am a little far from where you are.
Good luck with acquiring the fish you need to fill this tank.
Post some pic's of the tank.