Grammostola rosea RCF
Identity confidence: needs verification. We have not confirmed what this animal is. Ask us before you set anything up off the name alone.
Chilean Rose Hair Red Color Form: Advanced Care Guide
Keeper Snapshot: The original beginner tarantula: a dusty rose-and-gray terrestrial from the Atacama-edge scrub of Chile, and this is the Red Color Form, the rosier-red morph. Adults reach about 5-6 inches across; females are very long-lived (routinely 20+ and reportedly 30+ years with good care), males roughly 4-6. Care is genuinely minimal (dry substrate, a water dish, room temperature) the catch is patience: rosies are famous for months-long fasts and an on-again/off-again feeding response, and an individual's temperament can flip between molts.
Group: TarantulasDifficulty: Spice 2: BeginnerSetup: Dry terrestrialHandling: Discouraged
Use This Guide Safely
- Confirm the exact animal. Match this guide to the species, locality, size, and life stage on your label. If the ID is uncertain, use the more conservative part of the range and ask before changing the setup.
- Change one thing at a time. Treat temperature and humidity as target zones, then watch posture, burrowing, drinking, feeding, and molt behavior before making another adjustment.
- Respect the handling boundary. If the guide says no handling, fast, defensive, or medically significant, plan transfers with catch cups, locked lids, and no bare hands. For serious bites, stings, or symptoms, seek emergency medical care.
Quick Snapshot
| Temperature | 70-80°F |
|---|---|
| Humidity | Low ambient (40-55%), well ventilated; bone-dry substrate, full water dish |
| Setup Type | Dry terrestrial |
| Substrate | Bone-dry soil/coco mix, 2-4 in, with a cork hide |
| Feeding | Slings weekly; adults just a few prey items a month: long fasts are normal |
| Care Difficulty | Spice 2: Beginner |
| Handling | Discouraged |
Humidity zones: Very Low under 30% - Low 30-60% - Low-Moderate 40-70% - Moderate 60-80% - Moderate-High 70-85% - High 80%+ - Very High 90%+
Enclosure Format / Size Class
- Compact secure enclosure while it's a tiny sling
- Horizontal terrestrial burrow setup for juveniles and freshly-rehoused sub-adults
- Larger floor-space terrestrial build for the adult
Warnings First
- Avoid falls. Keep the enclosure low
- Long fasts are normal. Don't panic-feed
- Hair-kicker when annoyed
- Temperament flips between molts: calm one month, kicky the next
- Bone-dry only works with airflow behind it. A sealed dry enclosure still traps humid air at substrate level, which is where a terrestrial spends its life.
Simple Care
- Keep the substrate bone-dry with a full water dish: this is an arid species, no misting needed.
- Put pebbles in the dish so slings cannot drown.
- Good airflow low in the enclosure; dry substrate plus still air is not the same as a dry enclosure.
- Give a low enclosure, a cork-bark hide, and floor space.
- Temperament is variable: usually calm, but it will kick urticating hairs when annoyed and can flip moods between molts. Not a handling pet.
- Fasting for weeks or months is completely normal. Judge by body condition, not the calendar.
Advanced Keeper Notes
Enclosure & Microclimate
- Bone-dry substrate, 2-4 in, with a full water dish: overflowing the dish now and then is the only 'humidity' a rosie wants; a constantly damp enclosure is the fastest way to cause problems.
- Keep enclosure height low: a heavy-bodied terrestrial like this can rupture its abdomen in a fall from the lid.
- A cork-bark hide on the substrate is about all the décor it needs. The Burrow Buddy is built for this fella: dry substrate depth, hide, water dish. A full-grown adult eventually wants a roomier custom terrestrial build.
- Acclimatize small slings to dry conditions gradually. Keep one corner lightly damp at first and let the enclosure dry out over a couple of molts, with a water dish available throughout.
- Low enclosures are the ones most likely to be under-ventilated at the level that matters. Because the lid sits close to the substrate, lid vents mostly exchange the air above the spider rather than around it. Put vents low on two opposite walls so air crosses the floor. On an arid species this costs you nothing, since there is no humidity to preserve, and it is what keeps the area under the hide from holding a damp pocket after a dish spill.
- On a species this dry the ventilation and humidity relationship is entirely one-directional: more airflow is always better. Ambient will sit at 40 to 55% on its own and can drop below that without concern, because the spider hydrates from the dish rather than from the air.
- Judge by hand rather than by gauge. Substrate should read dry to the base everywhere except right around the dish, and any spill should be gone within a day or two. Substrate that stays cool and damp under the hide a week after a spill means the enclosure needs more airflow.
- Keep the dish full and put pebbles or coarse grit in it so the waterline sits below the rim. Slings drown in dishes scaled for adults, and this species is commonly bought small and kept for decades, so the pebbles matter most in the early years.
- During the sling acclimatization above, put the moisture under the hide rather than misting the enclosure. A damp patch beneath the cork gives a young rosie a humid microclimate to sit in while the open substrate dries out on schedule.
Feeding, Growth & Maintenance
- Grammostola rosea is the poster child for tarantula fasting: refusing food for weeks, months, even most of a year can be normal when body condition is healthy. Searching 'my rosie won't eat' returns endless threads; the answer is almost always 'wait'.
- Feeding schedule: slings 2×/week; juveniles every 7-10 days; adults just a few appropriately-sized prey items a month (four or five crickets is plenty). Keep each prey item smaller than the spider's abdomen.
- Read body condition, not the schedule: if the abdomen is narrower than the widest part of the carapace, feed more often; if it's plump and round, back off. Pull any uneaten feeder within a day, especially while it's hunkered down.
- Molting: a rosie heading into a molt goes quiet, hides, and stops eating for days to weeks. That's premolt, not illness, and it blurs right into the normal fasting. Leave it alone, remove feeders, and wait 5-10 days after the molt (until fangs and exoskeleton harden) before offering food again.
Possible Origin / Range
- Likely native range: Arid scrub and desert fringe of Chile (and bordering Argentina/Bolivia), including the edges of the Atacama: one of the driest regions on Earth. Hobby 'rose hairs' have long been a taxonomic tangle of Grammostola rosea and G. porteri; the Red Color Form (RCF) is the rosier-red morph usually sold as true G. rosea.
- Habitat translation: Dry terrestrial setup at room temperature, water dish always available, fall height kept low. No misting, no heat, no fuss.
Advanced Keeper Details
- Long fasts and slow growth are normal. Watch the abdomen, not the calendar.; fasts of several months (occasionally close to a year) are routine with no harm if body condition holds.
- Substrate deep enough to cushion a fall, shallow enough that a fall isn't dangerous; bone-dry with a water dish.
- Adult size ~5-6 in DLS; very long-lived: females routinely 20+ and reportedly 30+ years with good care, males ~4-6. Growth is slow at room temperature; consistent warmth (low-to-mid-80s °F) plus regular feeding speeds it up, but most keepers just let a rosie be a rosie.
- Temperament is genuinely variable and can flip between molts: a docile individual can become a hair-flicking, threat-posturing one and back again. It's why some keepers argue it isn't a true beginner species despite the trivially easy husbandry. Keep a catch cup ready for every rehouse and maintenance session.