Cleanup Crew Showdown—Ultimate Winner
The last couple of weeks, we have looked at various species that can serve as tank janitors, or the cleanup crew, for bioactive terrariums. These microfauna devour waste and decaying matter in the terrarium or vivarium, and improve the health of the soil.
This week, we narrow the detritivores down to one ultimate winner.
First, here’s a review of the previous showdowns:
Week 1 — Isopods vs. Millipedes
Isopods are easily found in exotic pet stores and gardening stores, and they come in many different colors and sizes. Millipedes aren’t sold as widely, but they are also available in a few different species.
The week 1 winner: Isopods for their availability and variety.
See the full article on isopods versus millipedes here.
Week 2 — Springtails vs. Earthworms
Springtails are small, unobtrusive, and breed quickly. They safely double as a food source for many reptiles and amphibians. Worms are excellent stealth custodians since they tend only to surface at night, but they make large burrows in the soil, which some find detracts from the aesthetic within glass terrarium walls.
Week 2 winner: Springtails for their versatility and easy breeding.
See the full article on springtails versus earthworms here.
Ultimate cleanup crew winner
The overall winner among custodial microfauna is:
Isopods.
Filling your bioactive terrarium with isopods allows you to pick and choose which species you prefer. Each species is a different color and size from the others. In fact, here’s a helpful video you can watch to find out more about isopod varieties:
You can easily create a mixed-custodian tank with several different isopod species. Although springtails and isopods are pretty similar when it comes to care and waste consumption, springtails just aren’t as interesting.
If aesthetics aren’t as important to you, then springtails are also a solid choice. Millipedes and earthworms are less common custodian choices, but you can certainly mix a few in with your isopods or springtails.
Getting started with isopods
If you’re looking to start your own bioactive terrarium, we have an article with step-by-step details on breeding isopods. That way, once you have a starter colony, you don’t have to purchase more.
Plus, they’re fairly easy to take care of, with minimal food requirements. You can feed bits of food, or a specialized isopod food mix. And they don’t require a water dish—just a tank misting to keep the area humid.
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Frequently Asked Questions
What is the best cleanup crew for a bioactive terrarium?
A combination of isopods and springtails is the gold standard. Springtails handle mold, fungus, and tiny organic debris, while isopods process larger waste like feces and shed skin. Together they cover all waste types. Dwarf white isopods and tropical springtails are the most versatile starter combination.
Do I need both isopods and springtails?
Ideally, yes. Each serves a different role. Springtails are the first responders that prevent mold and fungus. Isopods handle the heavier waste processing. Using only one limits the ecosystem's ability to self-clean. Both are inexpensive and easy to culture, so there is little reason not to use both.
Frequently Asked Questions
What is the best cleanup crew for a bioactive terrarium?
A combination of isopods and springtails is the most effective cleanup crew for most bioactive setups. Springtails handle mold and small organic particles, while isopods tackle larger waste like feces and shed skin. Together they cover all waste breakdown needs. Dwarf white isopods and tropical springtails are the most versatile pairing.
Do I need both isopods and springtails?
Using both is strongly recommended. Springtails excel at mold control and processing tiny organic matter, while isopods handle larger waste items. They occupy different niches and complement each other. A terrarium with only one type may develop mold issues (without springtails) or accumulate larger waste (without isopods).