they may not be from the us, which is why they call them fighter fish.
they wont die in a community tank nor be stressed out. in the wild, they live in large pools until the dry season, where the large ponds turn into pools of muddy water, and so they evolved to be able to breath air to survive the seasons. they do not perfer small tanks over large.
pygmy cories do not spend a lot of time on the bottom like other cories. you can get panda corys, which are smaller than some, but larger than pygmys, and they have the interesting coloring marks also and are quite fun to watch.
i would pass on the danios also and up the school of the tetras, then have a centerpece fish, like a pretty male betta or dwarf gourami
what kind of plants are you planning?