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Troubleshooting

Mould on food, in a culture or in a terrarium

Mould in a culture usually means too much food. Mould in a terrarium is something springtails help clear. Find out which you have.

Start from what you see

There is mould in my springtail culture or terrarium

Questions

  1. Question 1

    Where is the mould?

  2. Question 1

    Is the mould on leftover food?

Endings

Likely cause

Uneaten food has moulded

Act this week How sure: High

The answers point at one clear cause.

What to do

Mould in a clay culture is usually caused by overfeeding. The usual fix is to stop feeding until it clears, or to scrape aggressive mould off the clay surface. Anecdotal 1 Report Suggest a source
Springtails US reports that springtails prefer fresh food when cultured. They clean up mould blooms in terrariums, but given the choice they eat fresh dry rice or yeast rather than the mould that appears when a culture is overfed. Anecdotal 2 Report Suggest a source
Warning Every seller gives the same rule about amount. Give only what the springtails can eat before the food rots or moulds. Hobby consensus 1–4 Report Suggest a source

Guides that help

Likely cause

Mould the springtails cannot keep up with

Act this week How sure: Moderate

Several causes fit. This is the most common one.

What to do

Mould in a clay culture is usually caused by overfeeding. The usual fix is to stop feeding until it clears, or to scrape aggressive mould off the clay surface. Anecdotal 1 Report Suggest a source
MI Beneficials keeps its cultures airtight and opens the lid every 2 to 3 days for an air exchange. It says springtails slow down from too little oxygen and too much carbon dioxide when the lid stays shut. Anecdotal 4 Report Suggest a source
Warning Too much yeast left in a culture for too long causes mould. In the worst case it can kill the culture by raising the carbon dioxide concentration. Anecdotal 1 Report Suggest a source

Guides that help

Likely cause

Mould in an enclosure that has too few springtails

Keep watching How sure: Moderate

Several causes fit. This is the most common one.

What to do

Springtails US reports that springtails prefer fresh food when cultured. They clean up mould blooms in terrariums, but given the choice they eat fresh dry rice or yeast rather than the mould that appears when a culture is overfed. Anecdotal 2 Report Suggest a source
NEHERP introduces springtails to a live vivarium 3 to 5 weeks before adding inhabitants. The wait lets a population establish and helps prevent booms of less effective detritivores such as fungus gnats and detritivorous mites. Anecdotal 5 Report Suggest a source
Spread the contents of the culture through the substrate layer. Do not pack the substrate down or compress it. Anecdotal 5 Report Suggest a source

Guides that help

Also described as

  • mould in springtail culture
  • white fuzz on springtail food
  • springtails not eating mould
  • mould in my terrarium
  • mouldy springtail culture

Other problems

Nothing here fits? Tell us what you see. A new tree starts from a real report. Contribute

Sources for this guide

  1. 1

    Calcium Clay Springtail Cultures FAQ and Care

    Frog and Frond

    Link works · Retailer

    Cited at What if there is mould in the springtail culture?; How do I feed the cultures and how often?.

  2. 2

    The Moldy Rice Misconception

    Pavy R. 2023. Springtails US

    Link works · Retailer

    Cited at The fact is that springtails prefer fresh food; Conclusion.

  3. 3

    Springtail Soil Care Guide

    Springtails US

    Link works · Retailer

    Cited at Care and Harvesting.

  4. 4

    How To: Starting a White Springtail Feeder Culture on Clay

    MI Beneficials

    Link works · Retailer

    Cited at Food; Air exchange.

  5. 5

    Springtail Care & Breeding Information

    New England Herpetoculture

    Link works · Retailer

    Cited at Introducing Springtails Into A Vivarium.

Reviewed Oct 22, 2026