I'd imagine that 1 ppm could kill a baby axie, but it's certainly not good for adults either. Long term exposure of 1 ppm could probably kill an adult.
It also depends on your ph levels. If your ph is lower (I.e 7.5 and under) your looking at about 1.5 NH4 being very harmful
Where as a ph above 7.6 is gonna be very harmful if the NH4 gets to around 0.8 -1
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