Thanks all.
MrTom, yes, it's the only survivor, but there wasn't any effort on my part in raising them. The others didn't live long; some not even through their quarantine period. A couple were dead in the bag when they arrived. I'm pretty sure I was the only one that had any fish doa in both of those group buys. Just my luck! That's why I don't like to order fish online.
FishNAbowl, those are both Africans from Lake Tanganyika. The little fish is a cherry spot Tropheus fry. It's been living dangerously, swimming around in the open, but has managed to survive. Hopefully it'll look like Dad when it's grown up.