What is normal?
Trinidad Dwarf Tarantulas are fossorial, so long periods underground, closed burrow entrances and heavy excavation are normal for Cyriocosmus elegans.
Do not judge Cyriocosmus elegans by how visible the spider is on a particular day. A secure retreat is part of good husbandry even if it means you see a Trinidad Dwarf Tarantula less often.
Why tarantulas hide
Trinidad Dwarf Tarantulas may retreat after rehousing, before a moult, after a heavy meal or simply because the enclosure gives them a secure place to settle. Hiding alone does not mean Cyriocosmus elegans is unwell.
If water, temperature and enclosure conditions are suitable, leave a hidden Trinidad Dwarf Tarantula alone instead of repeatedly lifting cork or opening a burrow.
Burrowing
If Cyriocosmus elegans starts digging, let the spider decide how deep or elaborate the retreat becomes. Stable substrate and securely placed decor are more useful than trying to keep the burrow visible.
A Trinidad Dwarf Tarantula may move large amounts of substrate, block one entrance and open another. That is normal enclosure modification, not a reason to rebuild the setup.
Webbing
Webbing can help Cyriocosmus elegans line a retreat, detect movement and secure the area around a burrow or cork hide. The amount varies greatly between individuals and life stages.
Do not remove established webbing from a Trinidad Dwarf Tarantula just because it looks untidy. Clear only what genuinely blocks water access, a door or necessary maintenance.
Closed retreats and premoult
A sealed retreat can be a premoult sign in Cyriocosmus elegans, but spiders also close themselves in for other reasons. Remove loose live prey, keep water available and give the spider time.
Never dig out a Trinidad Dwarf Tarantula merely because it has been hidden longer than expected. Compare the behaviour with the spider's normal pattern and the condition of the enclosure.
When to investigate
Check more closely if Cyriocosmus elegans shows several concerning changes together, such as obvious loss of body condition, inability to move normally or an enclosure problem that could prevent access to water.
Visibility by itself is a poor health measure for Trinidad Dwarf Tarantulas. A spider that is hidden in a secure retreat may simply be behaving exactly as the species or individual prefers.