Given that the tank has been running for a while & is planted then I would say that it is ready for Neons. Do your tests a little more often after they are introduced to make sure nothing wierd happens. If need be do a couple of extra water changes.Gees, that is expensive Laura. Pretty often our big chains have neons and 10 for $10 or there abouts.
Water changes aren't a problem Ryan. I use my tank water on the garden and I have a large garden (about 1000 sqm - I live on 2.5 acres) so I am always changing. What sort of nitrate do neons suffer at? The tank in question has been established for 4 months and is heavily planted. I have never had the nitrates go above 10 in that tank.