I have the same problem you do with my well water, except sometimes worse. Last time I checked it was between 40-80 ppm. Until I graduate to a planted tank, I've been cutting the water with 1/2 bottled spring water and also added the Purigen to my filter. I'm think
the Purigen has made a difference - the nitrates stay around 5 ppm in my tank now.
But, like OFL said, he might be just fine with your water. I'm new to fish keeping so I tend to freak out a little about things.