I agree with all of the above. As ramsey said, you should re-think your water souce at some point in time, but that's not your problem. You should NEVER have detectable amounts of ammonia in your tank. If you do, there are other problems. And throwing a product at it is just a bandaid.

Like others have said, almost all of us have been through the same thing before - there is something about this hobby and people wanting to rush things.

Since everything has died, I'd just let the tank sit for a while. Check out your water supply, and unless you are using an RO/DI system, you might want to think about changing your water source.