Quick answer: Maintaining a bioactive terrarium means a quick daily check of temperature, humidity and water; weekly spot cleaning, glass wiping and a look at the drainage layer; monthly pruning, leaf litter top-ups and a crew check; and a yearly review of lighting, soil depth and plant layout. A balanced build rarely needs a full strip-out, but it is not maintenance-free.
The appeal of bioactive is that the enclosure does much of its own cleaning. The clean-up crew eats waste and mould, plants use the nutrients and the soil stays healthy for years. What keeps it that way is a light, regular routine. This page is that routine. If you have not built yours yet, start with how to set up a bioactive terrarium.
Maintenance schedule at a glance
| How often | Task | Why |
|---|---|---|
| Daily | Check temperatures and humidity; mist as needed; refresh drinking water | Conditions drift with the weather and the furnace |
| Daily | Remove uneaten fruit diets and dead feeders | Prevents smells, mites and flies |
| Weekly | Spot-clean large waste; wipe glass | The crew handles small waste, not large piles |
| Weekly | Check drainage water level (tropical builds) | Water touching the soil turns it sour |
| Weekly | Look for springtails and isopods under leaf litter | Early warning of crew decline |
| Monthly | Prune plants; remove dead leaves | Keeps light reaching lower plants and airflow open |
| Monthly | Top up leaf litter | It is food for isopods and breaks down steadily |
| Monthly | Clean misting nozzles, check equipment and timers | Clogs and failures creep up slowly |
| Every 3–6 months | Top up soil; add crew if numbers are low | Soil settles and decomposes over time |
| Yearly | Replace UVB on schedule; review layout and plants | UVB output fades before the light looks dim |
Daily: a two-minute check
- Read the gauges. Use a digital thermometer and hygrometer, ideally with a probe at the animal's level. Canadian homes swing a lot between seasons: furnaces dry the air in winter, and humid summers can push a vivarium too wet.
- Mist to the species' needs. Dart frog builds are usually misted once or twice daily; crested gecko builds once in the evening, allowed to dry by morning; arid builds rarely, except for a humid hide or a damp corner for the crew.
- Remove leftovers. Fruit-based gecko diets go off quickly, and dead crickets or roaches left in the soil are a common source of smells. Isopods will eat some, but large items overwhelm them.
- Glance at the animal. Eating, shedding, behaviour and droppings tell you more about the enclosure than any gauge.
Weekly: spot cleaning and water levels
Spot cleaning
Pick out large droppings, urates and shed skin that are sitting on the surface, especially from bigger animals like ball pythons, bearded dragons and blue-tongued skinks. The crew will deal with small waste, but piles from a large animal can outpace them. In arid builds with a leopard gecko, the animal usually uses one or two toilet corners, which makes this quick.
Glass
Wipe the glass with a clean cloth and plain water or diluted white vinegar. Avoid glass cleaners: ammonia and other residues can harm amphibians and invertebrates. Hard-water spots from misting can be prevented by using reverse-osmosis or distilled water.
Drainage layer
In tropical builds, look at the drainage layer through the glass. If water is getting close to the barrier, siphon it out with airline tubing or a turkey baster. Never let the soil sit in standing water.
Crew check
Lift a piece of cork or a few leaves. You should see springtails jumping and isopods scattering. If you cannot find any for a couple of weeks, read the crew section below.
Monthly: pruning, leaf litter and equipment
Pruning
Fast growers like pothos, philodendron and creeping fig can take over a vivarium in months. Trim them back so light reaches lower plants, airflow stays open and the animal can still use its climbing routes. Remove yellowing or rotting leaves rather than leaving them to break down on the plant. Cuttings of pothos and philodendron root easily in water and can be used to replace weaker plants or start another build. If plants are struggling rather than thriving, check lighting first, then nutrients; see how to fertilise terrarium plants safely.
Leaf litter
Leaf litter disappears steadily as isopods eat it. When patches of bare soil appear, add more. Mixing tougher leaves like oak and magnolia with softer ones gives a steady food supply. Our tropical leaf litter range includes several types.
Equipment
Check that lights and misting systems run on schedule, clean mineral build-up from misting nozzles, test thermostat probes against a second thermometer and make sure fan and vent openings are clear.
Every few months: soil and crew top-ups
Soil
Organic soil decomposes and settles. If roots are exposed or the soil is visibly lower, top up with fresh mix such as Jurassic ABG Terrarium Mix or Jurassic ABG Semi-Arid Blend for arid builds. Gently loosen compacted areas with a chopstick or skewer; avoid digging up the whole enclosure, which disrupts the crew and roots.
Clean-up crew
Crew populations rise and fall with food and moisture. They usually decline because the enclosure is too dry, there is not enough leaf litter, or the animal is eating them (dart frogs and some geckos will). To boost them:
- Keep one corner of the soil slightly moister, even in arid builds.
- Add leaf litter and a piece of cork bark for shelter.
- Offer a small pinch of fish flakes or dried yeast occasionally.
- Add a fresh culture. Keeping a small backup culture on the side makes this easy and cheap.
Choosing the right species for your build is covered on the best clean-up crews page.
Yearly: a review
- Replace UVB on the manufacturer's schedule, typically every 6–12 months depending on the bulb type.
- Review the layout. Are climbing routes still usable? Has a plant taken over? Is a hide buried?
- Swap struggling plants for species that suit the actual light and humidity in your enclosure. The bioactive plant planner can help.
- Clean the drainage tube or siphon point if you have one.
Seasonal care in Canada
Winter is the hardest season for most bioactive builds in Canada. Dry furnace air lowers humidity, rooms near windows get cold at night, and short days can leave plants light-starved if they rely on a window. Cover part of a screen top, check night-time temperatures and run lights on a timer. More on this in keeping a bioactive terrarium healthy through a Canadian winter. In summer, watch for overheating and excess humidity instead.
Troubleshooting quick reference
| Problem | Likely cause | Fix |
|---|---|---|
| Bad smell | Waterlogged soil, leftover food, low crew | See why does my bioactive enclosure stink? |
| White fuzzy mould | New wood or excess food | Usually harmless; springtails clear it. See mould in a bioactive terrarium |
| Plants stretching or yellowing | Not enough light | Brighter LED, closer, longer photoperiod (10–12 hours) |
| Plants rotting | Too wet, poor airflow | Mist less, increase ventilation |
| Fungus gnats or flies | Rotting fruit or overly wet soil | Remove food sooner, let the top layer dry slightly |
| Crew disappeared | Too dry, no leaf litter, eaten | Moisten a corner, add litter, re-seed |
If problems keep recurring, the cause is often in how the enclosure was built rather than how it is maintained. Bioactive terrarium mistakes to avoid covers the structural issues.
When a full strip-out is needed
Rarely, a bioactive enclosure needs to be stripped and rebuilt: after a contagious disease, a serious pest outbreak such as grain mites the crew cannot control, or soil that has gone fully anaerobic. In those cases, rehome the animal temporarily, discard the soil and leaf litter, clean the enclosure and hardscape, and rebuild with fresh, safe materials, layering it as described in how do you structure a terrarium?
FAQ
How often should you clean a bioactive terrarium?
Spot-clean large waste weekly, or more often for big animals, and wipe the glass as needed. You should not need to replace the substrate on a schedule as you would in a non-bioactive enclosure.
Do I need to feed the clean-up crew?
Usually not once the animal is in, because waste and leaf litter feed them. Keep leaf litter topped up, and add a small pinch of fish flakes or yeast occasionally if numbers drop or the enclosure is new.
How do I know if my bioactive terrarium is healthy?
It smells earthy, plants are putting out new growth, you can find springtails and isopods under leaves, mould appears only briefly and disappears, and the animal is eating and behaving normally.
Should I ever replace the soil?
Top it up as it settles and breaks down. Full replacement is only needed after disease, a major pest problem or a waterlogging failure that has turned the soil anaerobic.
Can I go on vacation with a bioactive terrarium?
For a week or so, usually yes, provided lights and heat are on timers and a thermostat, humidity is managed (an automatic mister helps for frogs) and the animal is fed appropriately. For longer trips, arrange a sitter to check on things.