At some point your spider will disappear into a thick silk retreat and stop coming out. This is the single most common moment when new keepers write to me convinced something is wrong. Almost always, the spider is molting, which means it’s growing.
While it’s in there, don’t open the web, don’t poke at it, and don’t offer food. A molting spider is soft and defenseless, and interference at the wrong moment can genuinely hurt it. Depending on age, the process can take anywhere from a few days to a couple of weeks. Keep lightly misting the enclosure wall, well away from the web, and wait it out.
After the spider emerges, its new exoskeleton needs several days to harden. Offer soft prey like flies about five to seven days later. If you find a pale, translucent second spider in the enclosure, that’s the shed skin, and it’s completely normal.
The members version covers stuck molts and exactly when to intervene. Morbid Club members can read it now.