I use these from Amazon. $9 ea in a bundle or ten bucks each. Others might have their own suggestions, I have these in every tub I keep a snake in. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I can vouch that they are tough, as one morning doing my morning checks on the tubs, I found it flipped over and submerged in the water bowl somehow. I can only imagine what that girl got into the night before. I took out the batteries, gave it a bit under the hair dryer, put the batteries back in and it has functioned fine ever since.
If you can't keep up the humidity try coconut husk. It's a spongelike quality when it comes to holding moisture. Is the top of your cage open air, or covered? If it's open try using press n seal on half of it to stifle air flow. That will also bring up humidity.
You'll get it all in line. As noted above that's a nice setup. Your ball will do well. You'll grow as he does.
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