My pair of multicincta rebounded quickly though they were not as bad as yours appear. All I did was add the moist hide and lower their temps. I think the biggest misconception is that zonata are the same as other colubrids. Their preferred temperature and humidity requirements can be very different. Most colubrids do not react the same way to elevated temps and lower humidity levels. As soon as my female zonata have laid eggs I take them off heat completely. Temps in the 70s and low 80s during the day are sufficient. I also prefer to drop the temp into the 60s at night though this is not always possible where I live. If you are running an 85 degree hot spot for your zonata hatchlings as is typical for most colubrids then they are too warm and likely too dry since that heat only serves to dessicate them.
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Rick Staub