You're welcome. I tend not to recommend specific fish as aquarists should have what they like, but I am always willing to pint out problems to avoid them if you find fish you might like. Just ensure you research the fish (post here on TFF for comments) before acquiring them, and you should be OK.
There are many options, but you need to keep the relatively small tank in mind. Most of these fish are shoaling species, meaning they must have a group of their own species, and while minimums like six are often suggested, it will always be better for the fish to have a few more, so don't just think "minimum" numbers.
Another thing to keep in mind is that the smaller the fish size, the more of them you want, but also it means you can have more variety with more than one or two species. If you were to decide on slightly larger fish, then your options would be less obviously.
Lighting is critical here too, as these fish are forest fish that do not appreciate bright overhead lighting. This is where floating plants can help. Lower plants are trickier, but nothing can be much easier than floating plants, and they will shade the aquarium so the fish will be brighter and settled. Lots of wood including branches will create an authentic aquascape. Sand is a good substrate, as some fish need it, but it too is authentic and will help to expand the visible space better than gravel. Now is the time to change the substrate if you have gravel and want to change it. A bag of play sand is very inexpensive.
