Nice looking fish.

I would recommend the larger characins such as Congo tetras (Phenacogrammus interruptus) and certain Pencilfish (Nannostomus sp.), avoid smaller tetras such as neons due to the reason stated above. Small catfish such as corydoras and plecs (in particular the smaller Panaque and Hypancistrus species) and if you can provide suitable water conditions a pair of Apistogramma dwarf cichlids would make nice centrepiece fish.

If you are short of space you might want to consider a corner tank, Juwel produce two of these called the Trigon range and come in 190 and 350 sizes (the size relates to the volume of the tank). However they can be expensive to buy.