Despite what you may read or someone may tell you, the "Black Neons" are a pretty decent sized fish at adulthood and extremely hardy. I've never seen or heard of them nipping fins or anything of the sort. Regardless of what you might find on websites, the captive-bred guys are indestructable.
To illustrate my point, a story:
I had a job a couple years back that suddenly required I spend several months in So Cal (I live in KY, btw). Anyhow, asked a friend who's a hobbyist to tend to my tank. When I got home a few months later, my java moss had invaded EVERYTHING and the tank was basically an ecological disaster. I was furious with my "friend," who's theory on caring for it involved a few shrimp pellets once a week. Thought everything was dead--couldn't really see, because java moss was everywhere . . . like zero visability in the tank. Point being, my school of black neons had--somehow--managed through the massacre. They were the smallest inhabitants and by far the hardiest. They, in fact, reside with a true, hobbyist friend of mine at this time and are in stellar health.
You could at least give them a look. Most are reasonably priced, so you won't regret any potential, future deaths. Contrastly, if they make it, you won't feel like you've got this school of ugly ducklings hanging out in your tank for the rest of eternity.