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Grindal Worms
Obtain a plastic container about a half gallon or a little more.  Fill the container with sterile potting soil and peat moss mixed half and half.  Moisten the soil but don't soak it.  You don't need mud.  Add a starter culture of worms and feed them with fish food flakes.   Feed a teaspoon a day.
Vinegar eels
To culture vinegar eels, start with  a container such as a 1 gallon jar or similar container with a wide mouth (wide enough to stick your hand through.) an apple, cider vinegar and water. Add a mixture of 50% cider, 50% water and  put a hand full of small, peeled apple cubes into the jar.  Put half of the starter into the culture and wait about  a day to give the bacteria time to get growing, and then put the second half of the starter into the jar. In about a month the culture should be ready for harvesting.  Use  an eye dropper to collect the worms. You will see them as a cloudy,  wriggling mass of worms clinging to the jar at the edge of the cider mixture.

White Worms
Start with a plywood box or large rubbermaid container, about 16" x 12" x 6" deep, with a close fitting, moisture-resistant top like a sheet of glass, or plastic lid. The box should be filled with moist potting soil, and kept at a temperature of  70F or below. During the summer, they will need to be kept moist and in a cool place, like a garage.  Feed them with white bread soaked in milk, or  a mixture of old lettuce, fruit,  bread crumbs, and oatmeal. Add water and blend it into a very thick  soup.   Feed a cup of this mixture  about once a week.  The mixture should be feed in a trench made in the soil.

Daphnia are great to feed your fry.  Uneaten Daphnia will eat the bacteria and 'crud' that is in the fry tank.  The Daphnia can be cultured in pretty much any container with a large surface area..  Do not use aeriation with daphnia. Use small amounts of light, low light.  A teperature of about 70 to 75F is good. The Daphnia can be feed twice a day with various algae scrapings and tank crud, as well as deactivated brewers yeast, and other small particulate type foods. The best food to use is green water.  Cultures must be cleaned out about once a week for gallon or smaller sized containers.  For large production you will want to use a small kiddi pool.  To harvest them use a net to catch them and rinse them off with clean water before placing in fry tank. 


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The culture should be kept at about 70 F. Put a piece of glass or plastic on the soil and put some food on it. The worms will crawl on top of it and you can harvest them. The worms should be washed off the glass or plastic into a cup of clean water to rinse them off. Use a medicine dropper to suck them up and place them in the tank. Make sure the soil stays moist.
Keep the worms in complete darkness. They will come out of the soil in a big wiggly mass and eat the food quickly. You can harvest them  from the soil. The worms will hide in the soil whenever a light comes on so you have to be quick collecting them.  Grab the worms and put them in a cup of water to rinse the dirt off of them.  Rinse and pour as many times as it takes to get the worms fairly clean.
To feed place a small bowl in the bottom of the tank.  Place worms in the bowl for the fish to eat.  If you don't use a bowl the worms will dig into the gravel where the bettas may not find them.

Pour it through a coffee filter into  another cup, and return the liquid to the culture. Many  of the eels will  pass through the filter, but some will have stuck to it. Pour fresh, clean water though the filter, then turn it inside out  and swish  the worms into a glass. Now feed them to your fry.

When your culture has accumulated lots of muck on the bottom it is time to start a fresh culture. ( It will take several months for it to get mucky)