It wasn't the bleach that killed the fish, but the massive bacterial die-off and the resutling ammonia spike that killed them.
I had a rough and short cycle, with levels approaching 16ppm as near as I can figure as it took very large water changes to even get the test kit to register levels not off the scale. I was testing the water twice a day, morning and night, and changing water 2 and 3 times in a row at 50% to 90% rates. Eventually I killed the last tetra with a shock of cold water. The cory survived. Now the tank is cycled and restocked.