Big water change asap.
If they were fed too much then the bio-load may have been too much!
Put Aquarium salt in your tank to guard against gill dammage. 1 TBS per every 5 gallons of tank water.
Also, double dose the filter media with beneficial bacteria.

salt will help protect the gills.
I would have been using salt from day 1 while they were exposed to ammonia.
Nitrite is still ammonia and harmful too.

Just double the dosage of the beneficial bacteria in you filter.
anytime you see ammonia present then do a water change and add the BB!

You're, no offense, taking things far too literally... you really need to protect the fishes' well-being before the cycling of the tank, you know Just to get them through this hard time in the tank. It's not like the cycle will stop completely just because you add salt!
So do try finding some salt to treat the tank with. Unless you notice most of the waste going away with the water change.
Did you change the water, and how much?

Minde-  I agree completely.  They are the small ones that had problems, which were not in good health to begin with.  The cycle of the tank took a tole on a few tiny ones.  It is fully cycled now and I did get my Salt but it was Monday before I could get anything, on Sunday pretty much everything shuts down here in the South.  No more ammonia to worry about now so I hope all goes well with them from here on out till they can get into that lovely pond. 

Also had so much going on this week is why it took me so long to get back on here.  Husband was at the verge of having to be hospitalized,  he had infection that spread down his right arm and into his hand, inside his body.  That actually started the weekend that I was having issues with the one little fish.  I went to my Moms to pick up some medicine for him since it was a Sunday and he refused to go to the hospital,  he calls me when I am just about to leave to go home and says my dog, Vahlla, was hit by a car.     What a terrible day and no vets open either.  She was not looking good when I got home and my husband could do nothing because he was running a high fever and couldn't use his right arm and hand at all.  I nursed her back to health and she pulled through with no problem.  All that worrying about my little fishy and then my husband and then my dog. WOW  What a week!  They are all good now and hope it stays that way!  They say when it rains it pours and this is so true!