The best way to tell if it's dead is to take it out of the water and take a good smell of it. You will know....trust me.
Just keep dosing with the ammonia or food. However you are cycling. Sometimes it seems like the cycle stalls but it will eventually convert.
Don't be too rough on yourself. Things like this has happened to most of us at some point in our fish keeping. As long as you learn from it, which you obviously have, it's okay. Just think, when you tank completes its cycle you can add some more and I have complete faith your next ones will be very well cared for. Heck if you are in the US I will gladly send you some of my babies for free. I know they would be well cared for.
. Just shoot me a PM in a month or so and I will mail some to you.
Chin up and patience. You are doing the best you can at this point.
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