Burrowing Whites?

[LilyPad]

There is also a chance that they'll ingest the orchid bark, leading to impaction. So it is good that you're changing it. I used a digital hygrometer but only put the probe in for a few minutes at a time to measure the humidity so it didn't get water trapped in it and cause poor readings. Eventually, you'll learn by feel and smell what the level is at. He's adorable though!

ETA: If he seems a little nervous, it might be a good idea to cover 3 sides of the tank to help him feel more comfortable.