I have 1 neon rainbow right now (long story) in a tank of larger rainbows, phantom tetras, Gouramis and loaches. He seems to get along well. Very pretty fish. I haven't had to do anything special to keep him. Never had them with killis, but I think they would do fine.
I actually got mine because my LFS had mixed a bunch of juvenile rainbows and couldn't tell them apart after they were in the tank. They made me a good deal to take the whole lot as " surprise rainbows". I ended up with 2 emeralds, 1 neon, and a few others that I haven't figured out yet.
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I strongly advise against intentionally farting whilst moving heavy weights. Sometimes -- especially under those circumstances -- farts have a solid center.
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