I have a group. They are interesting little fish. I wouldn't keep them with Apistogramma because they stay down around the roots of my plants. They get into a thatch of geographically incorrect Cryptocorynes and pop out like a whackamole game. Because of their size and shyness, the far far larger dwarf Cichlids would dominate them.
Plus I have the suspicion, entirely unproven, that they like specific places in the tank. I only ever see them in the Crypt wendtii area. They might possibly be a little territorial. It's hard, because they are also tiny and they might be intimidated. I made the mistake of putting them in a community tank, and now I would never catch them with stripping the tank down to the gravel.
They're beautiful and tiny. They ship badly compared to amandae/embers, which is partly why we haven't seen them as much. They are a blackwater fish from what I have heard from people who caught them, but here they have adjusted to my slightly acidic, soft clear water. But if I use rooibos tea to add tannins, it certainly increases their beauty.
They like live food but will settle for flake.
A friend copurchased with me and got about 40 for his six foot, aquascaped tank. He rarely sees them. They can be very shy. I got 20 but lost 10 in the first 48 of QT. He didn't QT them, so is uncertain how many he actually still has.