I have over a dozen loaches and personally, I don't think a 10 gallon is a good choice for them. They really like to zoom across the tank, from top to bottom both vertically and diagonally. A 10 gallon just isn't enough of a footprint for their behavior.
I would recommend no fewer than 5.
75: blood parrots, featherfin cat, emperor tetras, turquoise rainbowfish, BN plecos, japanese trapdoor; 46: WCMM, gold inca snails, ghost, bamboo & amano shrimp, kuhli loaches, rummynose & ember tetras, endlers, platies, flame gourami, guppies; 16: pygmy, peppered, loxozonus corys, otos, assassins, RCS ... ~ Research PRIOR to purchase.... ~