white cloud minnows are great. well, mine are anyway. IF the betta for some reason decides to pick on the minnows, they're too fast for him anyway. but i've only seen him flare at them once, when i first put him in. they keep to their own, and the betta doesn't mind them at all now. at walmart, it's recommended that you buy 5 or more minnows, cuz they swim in groups. i have three, and they rarely leave eachother.