You could always catch the fish. Bring it to where you got them. Have them hold on to them for you. Let the tank finish out the cycle which could be less than a week. Then do your water change after the nitrates are within reason and ammonia back to zero. Fish are saved and you do not have to buy new ones or just say my tank is cycling, I don't want them to die, resell them, and maybe give me a discount on another fish that I really wanted. At this point you got nothing to lose. Plus with those fish being stressed. Now you are talking about ich and other nasties that can become present in your tank. Ich is always present. Brew the right storm. They feed off the living fish. Fall off. Start their cycle of life. Bombing your tank now with 100s of new ich parasites and all that time is wasted that you did and then have to wait 76 days to starve out those parasites with no fish in your tank.