Start with the enclosure
Check the basics for Aphonopelma chalcodes: fresh water, suitable moisture, a secure retreat, good ventilation and a practical temperature range of 18–26°C. A clear husbandry problem matters more than a single evening of unusual activity.
For Arizona Blonde Tarantulas, keep the surface mostly dry with clean water available; modest moisture for smaller slings. If the enclosure is obviously too wet, too dry or difficult for the spider to use normally, correct that issue before looking for a more complicated explanation.
Know what is normal
For Aphonopelma chalcodes, Arizona Blonde Tarantulas are terrestrial tarantulas, so normal retreat use should make sense for that lifestyle. A hidden spider is not automatically a stressed spider, and a visible one is not automatically comfortable.
With Aphonopelma chalcodes, changes from the individual's usual routine are more informative than a generic list of 'stress signs'. Compare activity, feeding and retreat use with what the same spider normally does.
Climbing, pacing and restlessness
If an Arizona Blonde Tarantula repeatedly climbs or paces, check enclosure shape, moisture and recent disturbance. Mature males of Aphonopelma chalcodes may also roam much more after the ultimate moult.
One short burst of activity from Aphonopelma chalcodes matters less than a persistent pattern combined with poor body condition or an obvious enclosure problem.
Feeding changes
With Aphonopelma chalcodes, food refusal in Arizona Blonde Tarantulas is often normal around premoult, after a heavy meal or following a rehouse. Keep water available and remove ignored live prey.
If Aphonopelma chalcodes stops eating but remains well hydrated and otherwise behaves normally, observation is usually more useful than repeatedly opening the enclosure and offering food.
Changes that need quicker attention
In Aphonopelma chalcodes, visible injury, haemolymph loss, severe dehydration, inability to stand normally or major loss of coordination in an Arizona Blonde Tarantula deserves prompt attention.
If Aphonopelma chalcodes is physically deteriorating, correct any obvious husbandry problem immediately and seek experienced or veterinary help where appropriate.