Choosing a sling enclosure
Use an enclosure that is secure and easy to inspect for a Mexican Red Knee sling. It should be large enough for a retreat and water access but small enough that prey and the spider are easy to locate.
Match the shape to the Brachypelma hamorii terrestrial lifestyle. Arboreal slings need usable height and anchor points, fossorial slings need digging depth, and terrestrial slings need floor space with a low fall height.
Substrate and moisture
For young Mexican Red Knees, use predominantly dry terrestrial setup with a clean water dish and a small moisture gradient rather than a wet enclosure. Small containers change moisture faster than adult enclosures, so check the substrate rather than watering on autopilot.
Do not keep a Brachypelma hamorii sling permanently waterlogged. Good airflow and a sensible moisture gradient are safer than trying to make the whole container equally damp.
Water
Provide fresh water to Brachypelma hamorii as early as the enclosure allows. A very small, shallow water dish can be used for many slings; where that is impractical, keep suitable moisture available until a dish can be added safely.
Check water frequently because tiny dishes and small containers dry quickly. Do not rely on prey alone to hydrate a Mexican Red Knee sling.
Feeding slings
Feed Mexican Red Knees slings small, manageable prey. A pre-killed or disabled feeder can be useful for very small spiders that are not ready to tackle active prey.
Remove leftovers from Brachypelma hamorii before they spoil, especially in a small moist enclosure. Appetite may drop sharply before a moult.
Moulting
Young Brachypelma hamorii usually moult more often than adults. When a sling stops eating and becomes more secretive, premoult is a common explanation.
Remove live prey, keep water available and leave the Mexican Red Knee alone through the moult. Wait until the new exoskeleton and fangs have hardened before feeding again.
Rehousing a growing sling
Rehouse a Mexican Red Knee sling when the enclosure becomes genuinely cramped or difficult to maintain. Prepare the new setup completely before opening the old one.
Because small Mexican Red Knees can disappear through tiny gaps, check ventilation holes, lid edges and door clearances carefully before moving Brachypelma hamorii.
Simple records
Record moult dates for Brachypelma hamorii if you want to follow growth. A quick note of feeding and moulting is enough; there is no need to turn sling care into a complicated daily log.
Those dates make it easier to see what is normal for the individual Mexican Red Knee, especially when feeding slows or the interval between moults begins to lengthen.