I don't know what "charts" you are referring to, but I have little faith in such things. Fish compatibility (how many fish in an aquarium) is a matter of selecting fish that share the same water parameters (not all fish do :shock and have behaviours and personalities that will match (not always easy :-?). Then there is the adult size (which determines the effect on the biological system of the aquarium) and their respective needs with regard to swimming space or not, hiding spaces, plants, wood, do they need to be in a group or alone, etc. In a 23g aquarium, 40 ember tetras would be fine--but 40 swordtails would be a disaster.
I second the comment on the betta, probably not good for a community aquarium such as you seem to be working towards. There are some other colourful fish, but the first issue is your water parameters. Do you know the hardness and pH of your tap water? It is easier and safer to match fish to your water than to try to adjust your water for special fish.
With soft and slightly acidic water, you're ideally suited to almost any of the South American or SE Asian fish: characins (tetras, pencilfish, hatchetfish), rasbora, gourami, catfish, loaches--the list is almost endless. The fish you now have are livebearers, which ironically prefer harder water. They also reproduce like mad, which can be problematical for many aquarists.
I don't like suggesting fish to others, as it should be your aquarium with what you like in it. But given your water, I would definitely see if the store will accept the guppies and swordtail in exchange (most will, after all, they want your continued business) and consider establishing a community of soft water fish. Add some plants, and wow, you could have an incredible aquarium that many others stuck with hard alkaline tap water can only imagine.
Have a look at the photos under my "Aquariums" to see what's possible; these are all soft water, which is what comes out of my tap. And check out our fish profiles section; there are many species with info and photos, and the characin, catfish, cyprinid, anabantid sections in particular are mostly soft water fish. The numbers of fish will depend upon the species; many are shoaling fish that must be in small groups. We can talk about specific numbers if you have some fish in mind.
Byron.
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