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I have one. Besides a betta (yes, regardless of the small opening) or inverts, the only fish I found suitable were microrasboras or microdevarios. Frank sells some on his website Nano-Fish.
I actually wasn't pleased with the freshwater options I had, so I decided to make mine saltwater, btw.
Stock: black sand, a piece of drift wood, some live nano plants, as for fish
2 zebra Dino,1 pink Dino, and 3 fancy tail guppy,also have 8 cherry shrimp
But you can also go with neon tetras.
Oh yeah there are some kool looking saltwater ones
If you have large hands it might be difficult to get in, but it get's an undeservingly bad rap about being horrible to maintain. The only thing is, if you need to get your hand in at all, you'll have to take quite a bit of water out.
I mean, if you're looking for an easy tank, it is harder than a normal tank. It definitely has challenges, like it's horrible stock lighting. Also, stocking options are obviously limited.