Bally, I'm glad WD cleared up the chemical name thing. It saved me doing it. I would not get any new fish, not even replacements, until you get your water chemistry straightened out. Both ammonia and nitrites need to be kept below 0.25 ppm. Ideally they should stay there on their own before you add any fish. If you are using zeolite or water changes to keep them that low, your tank still needs to finish cycling. The less fish you have in while cycling, the better you will be. It will save you lots of water changes if you don't have as many fish.