Hello and Welcome to Koko's!
The problem is that your ammonia is too high. Ammonia that high inhibits the beneficial bacteria to grow, and the amount is too high for the cycle to accomodate.
Try doing a 75% water change and test again. The ammonia level shouldn't get above 4 - 5, but no more than .5 if you have fish in there!
If you have them in the other tank now, you may as well finish this as a fishless cycle. It's much less stressful for the fish.

Do you have the right ammonia? Once the ammonia level drops, you'll have to start adding it to feed the bb's (beneficial bacterias).
Debbie