Mourning geckos are tiny arboreal lizards native to tropical rainforests across the South Pacific, Central America, and Hawaii. At only 4 inches long, these social geckos require vertical climbing space and MUST be housed in groups. Proper enclosure setup is critical for this species' wellbeing, as they are naturally communal and rely on companions for normal behavior.
Minimum Enclosure Dimensions
Mourning geckos are obligate social animals and must NEVER be housed alone. The absolute minimum group size is 2 geckos, with 3-4 being ideal. Because they are arboreal (tree-dwelling), vertical space is more important than floor space. Height allows them to establish territories at different levels and maximize climbing opportunities.
Size Requirements by Group Size:
| Group Size | Minimum Dimensions (L—W—H) | Volume | Notes |
|---|---|---|---|
| 2-4 geckos | 12°12°18 inches | ~10 gallons | Standard minimum for small colony |
| 5-6 geckos | 18°18°24 inches | ~20 gallons | Better for breeding colonies |
| 7-10 geckos | 18°18°36 inches | ~30 gallons | Population growth accommodation |
| 10+ geckos | 24°18°36+ inches | 40+ gallons | Established colonies with offspring |
Plan for population growth! All mourning geckos are female and reproduce via parthenogenesis (no males needed). Each gecko can lay 2 eggs every 4-6 weeks, and offspring are fertile within 6-8 months. Start with adequate space or prepare to upgrade.
Enclosure Type Selection
Mourning geckos require high humidity (60-80%) and stable temperatures. Glass front-opening terrariums are ideal because they retain humidity better than screen cages while still allowing necessary ventilation.
Material Comparison:
| Material | Temperature Control | Humidity Management | Best Application |
|---|---|---|---|
| Glass (front-opening) | Excellent retention | High retention (60-80% ideal) | BEST for mourning geckos - maintains tropical conditions |
| PVC (custom) | Excellent insulation | Excellent retention | Good alternative, harder to source in 12°12°18 size |
| Screen/mesh | Poor retention | Too dry (30-40%) | AVOID - cannot maintain humidity requirements |
| Wood (sealed) | Good insulation | Good retention | Possible but heavy, requires waterproofing |
Recommended: Glass front-opening terrarium (e.g., Exo Terra, Zoo Med) with screen top for ventilation. Ensure doors close securely - mourning geckos are escape artists!
Internal Layout Design
Maximize vertical climbing space at all levels. Mourning geckos utilize the entire enclosure height and need branches, vines, and foliage from bottom to top. The warmest area should be near the top (under the heat lamp), with cooler zones toward the bottom.
Zone Layout Template (12°12°18 enclosure):
| Zone | Location | Temperature | Features |
|---|---|---|---|
| Basking/warm zone | Top third (under heat lamp) | 80-85°F | Horizontal branches, leaf canopy, feeding ledge |
| Mid-range zone | Middle third | 75-78°F | Diagonal branches, vines, cork bark hides |
| Cool zone | Bottom third | 70-75°F | Ground cover, leaf litter, humid hides |
| Nighttime | All zones | 65-72°F | No temperature drop below 65°F |
Create multiple climbing pathways at each level so geckos can move vertically without conflict. Social doesn't mean they won't compete for prime basking spots!
Assembly Instructions
Follow this order for efficient setup:
- Substrate layer: Add 2-4 inches of tropical substrate mix (60% organic topsoil + 40% coconut fiber), then top with leaf litter
- Background structures: Position largest branches and cork bark against back and side walls, angling from bottom to top
- Mid-enclosure features: Add diagonal branches and vines creating climbing pathways at multiple heights
- Foliage placement: Distribute plants evenly (top, middle, bottom) ensuring each level has cover
- Feeding stations: Attach magnetic ledges at different heights to reduce competition during feeding
- Equipment mounting: Place heat lamp over one upper corner (not center), UVB bulb on side of hood, probe placement mid-height
- Testing phase: Run equipment for 24-48 hours before adding geckos, adjust heat dimmer to achieve 80-85°F basking spot
CRITICAL: Basking temperature must NOT exceed 85°F. Temperatures above 85°F can cause heat stress and death. Use a dimmer to fine-tune wattage - do not rely on guessing bulb size!
Common Setup Mistakes
Mistakes to Avoid:
| Mistake | Problem | Solution |
|---|---|---|
| Housing only 1 gecko | Severe stress, abnormal behavior, shortened lifespan | Always keep groups of 2+ (they're social!) |
| All-screen enclosure | Humidity drops to 30-40%, dehydration | Use glass terrarium with screen top only |
| Excessive heat wattage | Overheating above 85°F = lethal | Start with 25w + dimmer, measure with temp gun |
| No UVB | Weak bones, egg binding, metabolic issues | Provide 5.0 UVB even though they're nocturnal |
| Insufficient climbing surfaces | Limited territory, increased aggression | Add branches/vines at all heights |
| Only 1 feeding station | Dominant geckos monopolize food | Provide multiple feeding ledges |
| No population planning | Colony outgrows enclosure in 6-12 months | Start larger or prepare to upgrade |
Maintenance Schedule
Regular Maintenance:
| Task | Frequency | Notes |
|---|---|---|
| Mist enclosure | Morning + evening | Use tap/spring water (not distilled) |
| Remove old CGD | Every 24-48 hours | Prevent mold growth |
| Spot clean waste | Daily | Remove visible feces/urates |
| Check temperatures | Daily | Basking 80-85°F, cool zone 70-75°F |
| Rotate feeding ledges | Every 3-4 days | Prevent territorial guarding |
| Full substrate change | Every 1-3 months | Or go bioactive for less maintenance |
| Replace UVB bulb | Every 6-12 months | Even if still producing light |
Pro tip: Consider bioactive substrate from the start. With cleanup crew (springtails and dwarf isopods), you'll only need to spot clean and never do full substrate changes!