Grindal worms are a small white worm. They are about half an inch long with the babies are very small. They are a perfect food for fry. They do contain a high amount of fat so they should not be the sole source of food. The name comes from the Swedish woman biologist that first discovered them. They will survive in slight higher temperature than regular micro or white worms.

You do not have to worry about the sex ratio. These worms are true hermaphrodites. They are literal both sexes so any two worms can mate and often do. They can lay hundreds of eggs each which is lucky for us. They eggs hatch in a few days start to eat and mature in just a few days.

I use peat moss as the base for my soil. It is very difficult to wet. A little garden lime is added to the mix to keep the soil from becoming too acid. I usually keep it in a box and pour water on it and wait a few days for it to moisten. You can use any type of plastic container that is a few inches deep. I ship the Grindal worm in used yogurt container. It is very important that you have ventilation. If the container is sealed, the worms will died within a couple days. I have learned this lesson a couple times. I use a large paper clip to melt the holes in the lid. I pull one end straight up making a t-shape. I heat the end up on a burner to make the holes. There six or more holes in the each lid. These holes are small enough that makes it hard for fungus gnats get in or out of the containers. By melting the holes it make a small rim that it makes it less likely for the worms to crawl out. Also if the holes are too large the soil may dry out.

I use dog food to feed the worms. It needs to be soaked to make it soft enough for the worms to chew. The important trick is not to put too much food at one time. It will become moldy. As the number of worms increase they will eat more. If they eat all the food in less than 24 hours you need to increase the amount.

It is easy to start another culture by scooping some worms out with a spoon and placing in the new culture. You can also divide the soil into several other cultures. It is important for the soil to be moist. The major component of the growing worms is water. In order for the worms to grow rapidly they need to have moisture available. The worms will not stay on the surface if the humidity is low. They prefer to be in a low light situation. If there is food available they will stay and eat.

As the culture ages the productively the worms decrease. You need to start new culture regularly. It is always good to not have all your worms in one container. If something happens to one culture then you have another to start over again.

If you have any questions that are not included in this guide, contact me. I will try to revise the guide to include anything not covered.