I was just reading about this and don't want to start a debate, but what I've read thus far is that cycle will not stall from nitrite excess. Ammonia, yes. But not nitrite.
As you dose more ammonia, you create more nitrite each time. Sometime like 4ppm ammonia creates 11.2ppm nitrite. So each day you add more and more. The bacteria that changes nitrite to nitrate has not yet grown enough, so it will continue to rise until. Boom. All nitrite disappears as the exponential growth of the final bacteria changes nitrite to nitrate. So, when we do a big water change and radically reduce the amount of nitrite in the water, and then suddenly it cycles, this isnt because it has stalled. Rather it is because the bacteria now has far less nitrite to eat through.
But then again...I do the water change and the tank cycles as well...so I dont know what I believe.
Either plug on and wait. Or water change and you'll probably see some fast changes. Also, water change should be done simply for the mineral replenish.
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