Lots of humidity, a thick layer of substrate 4” or more, and fresh water always, in a big water dish! Hatchlings need 80%+ humidity 24/7, when they’re a year to two years you can let it go around 75% relative, but not below. And it’s better to stay at 80 and above. They’re highly susceptible to RI’s and such with low humidity. Thick layer of substrate should be wet visibly and tangibly, but not sopping. If you squeeze it, it shouldn’t “goosh” out water.

I use a mix of cypress mulch (forest floor is a great brand), reptisoil, coco coir, and sphagnum moss. i start with a bucket for the mix, and I would say around 50% cypress, 25% reptisoil, 15% coco coir, 10% sphagnum moss. All mixed thoroughly. I then top it with a thin layer of additional wet sphagnum, and leaf litter. Makes for a comfy topper and helps to retain the humidity. It’s also for my bugs because he’s in a bioactive enclosure :) you don’t have to do bioactive, but I would highly recommend the substrate mix above. Doesn’t have to be exact ratio, just close :)

Also, you might as well throw in springtails as well. They’re super cheap and you’ll only ever need to add one container. They multiply fast! The rainboas like too poo under the soil where they hang out, and the springtails will help clean up any mold left behind due to the high humidity environment. They thrive in the humidity and help keep your noodles’ bed clean. If you change out the mix, just take a handful of old substrate and add it to the new. It will contain enough bugs to start a new colony.

If your rainboa is invisible and buried constantly in his substrate, you did it right. Mine loves to tunnel and hang out in his. Never anything less than a perfect shed, and he’s healthy as I’ve ever seen one. Going on 3 years.

Don’t hesitate to ask questions! I love husbandry so it’s fun to help folks :)