Yeah, I'm with Diana, pick 1 species! We know it's hard to do...that's why many of us have more than 1 or 2 tanks,

. You want to see the best from your loaches...& that means at least 5 or 6 of a species. Your tank is not big enough to house 2 5 inch loach species of at least 5 of each.
What species is most available to you? That might be a starting point for your choice. Study the differences between dario & kubotai, they're not really so similar if you look hard...& you should be looking hard for species & for health! By the horizontal lines forming along their lateral lines I'm sticking to b. kubotai not rostrata, but still, 5 inch fish if kubotai; 5 or 6 inch if darios
I have a bit of metric vs English measurement dyslexia at times Is it covered?... what dimensions are your tank? Long is better for loaches...