I've read that they can be aggressive too, become territorial.
From what I've read, otos actually like being with others, like group of 3 or so. And are also frequently mislabled chinese algae eaters are sold as otos (so make sure you get otos :P)
What kind of substrate do you have for the loach? I've read that sand or smooth stones are best, no sharp aquarium decor (though that is basically true for all fish anyway) so they don't hurt themselves.
Swordtails are schooling fish too, suggested that one male and three females together. I guess they're jumpers too :P according to a breeder of them at least.