Here is what I do for my tank. I have Beauty in a 55 gallon tank as he is 4 foot long. I have flex watt on warm side with ranco thermostat. On cool I have a 11 watt uth with another thermostat. The temps are 90 on warm and 85 on cool. I then have the water dish in the middle under the main light. This produces a humidity level of 64%. Then when shedding starts I bump up the humidity by placing warm water in the dish.

I have also covered 3/4 of my screen on top to hold in the moistuer.

I hope this helps.

Regards,
Beauty the BP