Yes, I agree with everything that Todd said, he did say fast didn't he?

Anyway, after that is done, then it will be time to find what caused the ammonia spike.

It could have been from:

1. removal of bio-balls too fast
2. Something died and is decaying somewhere in your tank
3. without the bio-balls, your other forms of biological filtration cannot keep up with your fishload / waste and feeding habits. This may be due to not enough liverock / sand in your system.