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I have them as well, picked up 10 expecting some not to make it in my high light, high ppm C02 tanks. They are all doing extremely well and are very active and healthy. They school with my neons as well, love em!
Yes, I have three and the reason why is that they school with other tetra just fine (my other 5 'usual' neons), and both of my tetra actually school with my minnows, so overall I have a school of 3+5+4=12 fish. Looks great.
Black neons are a great fish, I always try and plug them!
I think Black Neons look really nice in heavily planted tanks. Their black stripe stands out really well against green plants. I've never kept these guys, but would like to have a school eventually in a planted tank.