The fish seem to be acting normal. The tank had completely cycled prior to adding the other 4 fish one at a time over 3-4 weeks. I think we may have unknowingly cleaned the gravel a little too much after adding the new fish. We knew the more fish; the more waste. But that may have hurt us in the long run. We haven't cleaned the gravel in the last 2 weeks since this ammonia and nitrite spike happened because of the advice of the local pet stores. We will try adding the bacteria from our smaller tanks filter into one of our existing filters to see if that speeds up the process any. We may also add another filter to see if that helps to keep the waste under control. I didn't think we had too many fish but now I think I may have been wrong. I have read that with goldfish they need more than twice the filtration of tropical fish tanks.
Also I have added salt to help with the stress on the fish. I didn't know that Prime can give an ammonia reading. That's good to know.
Thanks,
Willow