Yes, it's fun to watch them grow...they start off so tiny, about the size of a pencil. I've never used tubs for hatchlings- I used "shoebox" size plastic "Critter Cottages"
with the (colorful) ventilated snap-on lids, and used UTH narrow tape under one end. DO NOT OVERHEAT corn snakes...they are very different from BPs...and mostly
prefer room temperatures (mine are 70-72* in winter) but should have one corner (only) that is warmer, about 87*. Paper towels for substrate, small boxes or card-
board paper towel tube for hides, small bowl water.
If you use heat tape, please read the cautions carefully on this site (Reptile Basics) below the illustrations...I've used yards of Flexwatt for decades safely & prefer it.
I'd expect the same performance from the similar tapes sold that are other brands. http://www.reptilebasics.com/heat-tape
Corn snakes love a humid hide, & btw, you are misinformed that they need low humidity...they are from various eastern U.S. states that rain a lot- Carolinas thru Florida.
But I've even lived in the desert with corns without problems, just gave a bigger water bowl. They are EASY snakes. For my adults I use a single layer of paper towel-
(it makes it easier to roll up & change too) & on top of that, a mix of clean paper shreds & Carefresh (-which does have a somewhat dehydrating effect, it's very absorb-
ent). When they shed you can also mist the cage a few times, but in my adult's cages, they have a humid hide with moist moss...however, they don't need it as much
as they just seem to enjoy it. I consider it "habitat enrichment". I would not use moist substrate (like damp eco-earth) thru-out their cage, & honestly they normally
don't have trouble shedding even without a humid hide.