I've not had that experience with Aphonopelma moderatum, but my one of my old wild caught Aphonopelma species (which one exactly is unclear) would do it every year through the winter months. That was an adult, though, so I didn't worry about it much.
Totally normal. They can be quite reclusive sometimes. If you cover the tank with something dark it might burrow up next to the glass
Thx, as I have assumed.
I’ve had a B klassi underground for months with no visible exit. Also, a A chalcodes I haven’t seen in nearly as long. I think they come out at night sometimes, so keep the water bowl topped off at least. They probably aren’t hungry when they barricade themselves in but I still offer a prekilled prey item every couple of weeks.I just remove it if it’s still there in the morning.
When you have a spiderling, or adult for that matter, that burrows itself in the soil and plugs up the entrance you have to slowly and carefully pour water into the soil above where the burrow is so it drains to the bottom forming a little puddle for the spider to drink from. Don't count on the spider to unearth itself to go drink from a water dish. Sometimes burrowing and plugging the entrance is the spider's way of avoiding desiccation when conditions are too dry for too long. Unfortunately for tarantulas in captivity, following that instinct could lead to death from dehydration if the keeper has the mindset that too much water can harm a tarantula from a dry region. Tarantulas, regardless of where they come from, can tolerate occasional flooding better than they can handle prolonged drought conditions.
I will give that a shot.