I can't see a problem with neons. A school of 5 or so (to keep them happy) should be fine. Even better if you can get a few more. I have 14 with platys and they are all fine. The neons hang around the middle of the tank. I just wanted 10 but the LFS gave me a few more and no problems. I believe that with neons your tank has to be well cycled/aged.