How to Set Up and Maintain a Microworm Culture for Fish Fry and Axolotls

Materials You’ll Need:

1. A small, shallow plastic container with a lid (e.g., a deli container or Tupperware).

2. A breathable cover (plastic lid with small holes, or a cloth secured with a rubber band).

3. A substrate for the microworms:

• Oatmeal or instant mashed potatoes work well.

4. A small piece of baker’s yeast.

5. Your microworm starter culture.

Setting Up the Culture:

1. Prepare the Substrate:

• Mix oatmeal or instant mashed potatoes with water to create a thick paste. It should be moist but not overly wet.

• Spread the paste evenly on the bottom of your container, about ½–1 inch thick.

2. Add Yeast:

• Sprinkle a tiny pinch of baker’s yeast over the surface of the substrate. The yeast serves as food for the microworms.

3. Add the Starter Culture:

• Spread your microworm starter culture on top of the prepared substrate. Try to spread it out evenly.

4. Cover the Container:

• Place the breathable lid on the container. If you’re using a solid plastic lid, poke small holes for airflow to prevent the culture from becoming anaerobic.

5. Store in the Right Location:

• Keep the container in a warm, dark place (around 70–85°F or 21–29°C). Avoid direct sunlight and temperature extremes.

Harvesting Microworms:

• Ready in 2–3 Days:

Once the culture is established, you’ll see microworms climbing up the walls of the container.

• Use a cotton swab, a clean finger, or a small brush to gently collect them.

• Rinse them into your aquarium or feed them directly to your fish.

Maintaining the Culture:

1. Refresh the Culture Weekly:

• Once the substrate begins to smell sour, dries out, or the population declines, start a new culture using a small portion of the old one.

2. Avoid Overfeeding Yeast:

• Too much yeast can cause the culture to ferment and spoil.

3. Keep Multiple Cultures:

• Maintain at least two cultures at a time in case one fails.

With proper care, your microworm culture will provide a reliable, nutritious live food source for your fish!