also, since you said you're not interested in breeding (I"m not either), just be aware that if you have at least 1 male with several females they could very possibly spawn. They lay a few large-ish eggs that then hatch into fry.
I asked how I could prevent my pair (1 boy, 1 girl) from breeding, and the response was, you can't, except by separating the sexes. But mine get along so well that I don't want to risk perturbing the balance. I was reassured that if they spawn, it's OK to just let suck up the babies with water changes.
I thought it was cruel, but they said the fry require special care (no suction filtration, special baby food) and that most die in the wild, anyway. So if I didn't make those special considerations to raise fry, that they would just die and to suck them up whenever I siphon.
So I'm just crossing my fingers and hoping they don't ever breed.