Re: New Rack, any advice?
If you have a dollar store or a Big Lots(or a Walmart works too), get an inexpensive soldering wand and put some holes in the tubs. If they are 15qt tubs, I like to do 5-6 across the front/back and 7 along the long sides. This gives a good humidity range for me when the snake and waterbowl are in the tub.
Start with fewer holes though and you can make more if the humidity gets too high.
Re: New Rack, any advice?
It would depend on the humidty levels in the tubs once set up. I would set it up and get the heat set with the water bowl you are going to use, once the warm and hot spots are right check the humidity, if its high put holes to let some out.
I hope that helps some.
Re: New Rack, any advice?
We haven't seen the need yet to drill any holes in our Iris tubs in the Reptile Basics rack. We haven't had this rack through all 4 seasons yet so we'll be monitoring it and will add a few holes if required. At this point though it seems perfect for the snakes and we're getting consistently beautiful complete sheds.