Enclosure shape and space
Costa Rican Orange Mouths are arboreal, so the enclosure should provide useful height, an upright cork retreat and several secure webbing points. The upper half should feel structured rather than empty, with enough room for Psalmopoeus reduncus to turn and move without being pressed against the walls.
Do not put a small Costa Rican Orange Mouth straight into an adult-sized enclosure simply because the species eventually reaches about 13–15 cm (5–6 in). Match the setup to the spider's current size so it can find prey, reach water and settle into a retreat without disappearing into a large amount of unused space.
Substrate and retreat
Substrate still matters for Psalmopoeus reduncus, but the main retreat belongs above ground. Arrange the cork and other anchor points before the spider goes in, then leave the webbed retreat alone once it has settled.
Young and adult Costa Rican Orange Mouths may spend much of their time inside a webbed retreat. That is normal. If the spider webs over an entrance or chooses a position that makes it harder to see, leave the retreat intact unless there is a genuine husbandry problem.
Moisture and ventilation
For Costa Rican Orange Mouths, maintain moderate moisture with strong ventilation and a water dish. You do not need every part of the substrate to be equally wet. Adjust the amount of water to how quickly the enclosure actually dries.
Ventilation is just as important for Psalmopoeus reduncus as moisture. Persistent condensation, a stale smell or substrate that stays wet for days usually means the enclosure needs less water, more airflow, or both.
Water dish and access
Every Costa Rican Orange Mouth should have access to fresh water. For Psalmopoeus reduncus, use a shallow, stable dish and place it somewhere you can reach without dismantling the spider's retreat.
For Psalmopoeus reduncus, leave enough clear space near the opening to add prey, remove food remains and refill the water safely. If every basic job means pulling apart webbing, moving cork or disturbing a burrow, change the layout.
Temperature and placement
A practical temperature range for Psalmopoeus reduncus is 22–27°C. Put the enclosure somewhere the room temperature changes gradually, away from direct sunlight, radiators and electronics that create local hot spots.
Do not attach a heat mat directly to the Psalmopoeus reduncus enclosure. If the room is genuinely too cold, warm the room instead of creating one concentrated hot surface against the container.
Security and maintenance
An individual Costa Rican Orange Mouth can react differently from another of the same species, so check where the spider is before opening the enclosure. Make sure doors and lids close securely and that ventilation holes are too small for Psalmopoeus reduncus to escape through.
When maintaining Psalmopoeus reduncus, use long tools when they make the job safer and keep a catch cup ready for rehousing. Handling is not necessary for routine care, and a well-planned enclosure should let you do most jobs without putting your hands near the spider.
When to rehouse
Rehouse a Costa Rican Orange Mouth when the enclosure has genuinely become cramped or difficult to maintain. For Psalmopoeus reduncus, a retreat that no longer fits the spider, too little substrate for normal behaviour or awkward access to water are better reasons to move than the spider simply touching a wall.
Prepare the new enclosure completely before moving Psalmopoeus reduncus. Add the substrate, retreat and water dish first, check the lid and ventilation, and make sure any cork or decoration is stable before the transfer begins.
What a good setup should achieve
A good enclosure for Psalmopoeus reduncus lets the spider behave normally and lets the keeper carry out basic care without repeatedly disturbing it. The enclosure shape, substrate and retreat should all suit the same arboreal lifestyle.
Once a Costa Rican Orange Mouth has settled in, resist the urge to keep rearranging the enclosure for appearance. With Psalmopoeus reduncus, if the spider is secure, fresh water is easy to provide and the moisture and ventilation are working well, the setup is doing its job.