Any of the Boraras microrasbora would do well or a small school of Ember/Ruby tetra would work. For something more akin to a focal fish maybe consider one of the Badis or even one of the Everglades pygmy perch for something odd and actually a native
Really nice suggestions. Scarlet Gem Badis ia a go. I wonder though if I can also keep a small shoal of the ruby tetra with them given the size of the tank. Parameters are 17" wide, 10" deep, and about 7" of height (actual after substrate). 1 or two of the Badis and about 6 of the tetras. Tank heavily planted. Do you think that would be doable? Would the schooling fish in particular be comfortable in these parameters?Any of the Boraras microrasbora would do well or a small school of Ember/Ruby tetra would work. For something more akin to a focal fish maybe consider one of the Badis or even one of the Everglades pygmy perch for something odd and actually a native