most incubate at 89 because it hatches babies faster. i incubate anywhere from 86-90 and all hatch fine. 85 may be low but it would only push the hatch date back. if a snake HAD to have 90 degrees to have its eggs hatch that snake would not exist in the wild. temps fluctuate, humidity fluctuates, other animals paw through the clutch and knock some around while eating other ones. these things happen in the wild and babies still hatch their. the suggested temps are guidelines. not set in stone rules.
adam jeffery