dcallen
To me, it sounds like you have parasites. Based on the fact that the fish are hiding and from your observations. I do not think the problem will go away on its own though.
If you cut back on the feeding, then the nitrates will go down. Unless you already have them in your tap water to begin with. Check carefully because you might have a dead fish in the tank.
There are some parasites that you can cure with salt and slightly elevated temperatures. There is also a correct procedure for adding salt to the tank. You also have to know exactly how much water is in your tank. Some fish cannot tolerate a lot of salt. It's been a long time, but I think first you add one teaspoon per gallon for the first day. Elevate the temperature to 80F. The next day, add another teaspoon. And if there are no problems, add another teaspoon the third day. The problem, ofcourse, is that your fish might go downhill by then. And some parasites cannot be cured this way. Your best bet is to use a wide-spectrum anti-parasitic that is powerful enough for bigger parasites like fluke, anchor worms, and leeches.
My choice would be something like Paragon.
By the way, I was pulling for the Mavericks.