Isopods for terrariums: the heavy-duty cleanup crew
When springtails aren't enough, isopods handle the bigger jobs. Species, care, and pairing with terrariums.
Isopods (pillbugs, sowbugs, rolly pollies) are the heavy-duty cleanup crew for terrariums. They eat larger organic debris that springtails can’t handle.
What isopods do
- Eat dead leaves and plant matter
- Break down larger debris
- Aerate substrate as they burrow
- Compete with pest species
They pair with springtails for a complete cleanup system.
Best species for terrariums
Dwarf white isopods (Trichorhina tomentosa)
- Size: Tiny (5mm)
- Best for: Small terrariums, beginners
- Behavior: Gentle, won’t damage plants
- Reproduction: Fast
The default terrarium isopod. Almost everyone starts here.
Powder orange isopods (Porcellionides pruinosus)
- Size: Small (8mm)
- Best for: Medium terrariums, color interest
- Behavior: Active, visible
- Reproduction: Medium
Dairy cow isopods (Porcellio laevis)
- Size: Medium (15mm)
- Best for: Larger terrariums
- Behavior: Fast, bold
- Reproduction: Fast
Springtails + isopods
Most bioactive builds have BOTH. Springtails handle mold and tiny debris; isopods handle leaves and bigger material.
What to AVOID
- Wild-caught isopods — may carry parasites, unknown species
- Giant isopods (Porcellio scaber large varieties) — damage plants
- Pillbugs from outdoors — different species, often too large
- Armadillidium species in small jars — too big, eat plants when hungry
Where to buy
- Josh’s Frogs — best quality, ships well
- The Bio Dude — terrarium-focused
- Etsy — many small US/EU breeders
- Local breeders — Facebook groups, r/isopods
Cost: $10-25 per starter culture (10-15 individuals).
How to introduce them
- Quarantine new isopods in their own container for 1-2 weeks
- Check for pests/disease
- Open terrarium
- Dump culture into terrarium
- They’ll find their spots within hours
Quantity to add:
- Quart jar: 5-10 individuals
- Gallon jar: 15-25 individuals
- 5+ gallon jar: 30-50 individuals
Care in the terrarium
Once established, isopods need almost nothing:
- Food: Leaf litter + occasional vegetable scraps (carrot, sweet potato)
- Water: High humidity handles it; mist if dry
- Light: Avoid direct sun (they hide)
- Temperature: Most species do fine at 65-80°F
Common problems
Isopods eating plants
Cause: Not enough food elsewhere Fix: Add more leaf litter, supplement with vegetable scraps
Isopods dying off
Cause: Too dry, too hot, or contamination Fix: Increase humidity, check temperature, ensure no chemical exposure
Isopods overrunning the jar
Cause: Too much food available Fix: Reduce feeding, let population stabilize naturally
Can’t see them
Cause: Hiding (normal during day) Fix: Look under leaf litter, lift hardscape. They’re there.
Pairing with springtails
The ideal setup:
- Springtails control mold and tiny debris
- Isopods handle larger debris and aerate substrate
- Together they prevent most terrarium problems
If you can only add one, start with springtails (cheaper, easier, faster setup).
The breeding bonus
Once established, isopod populations are self-sustaining. They breed, the colony grows, and you’ll have a permanent cleanup crew. Many terrarium builders also sell excess cultures to other hobbyists — small side income.
For more on bioactive setups, see our bioactive starter guide.
Questions about your isopod setup? Ask in the Discord.