These little creatures are about 1/16th of an inch and are another easily cultured fish food. Being that they are very small free-living nematodes, they make great food for fry. They are also tolerant of heat (80's) so no special conditions are needed to raise microworms.
Fruit Flies
Take a tall jar, like spaghetti sauce jar and add about an inch or so of mixed baby cereal. You need air coming in without allowing the flies to escape. Mix up a solution of one package of yeast in warm water. Once the yeast is dissolved, use it to mix into the cereal. You should end up with a wet cereal that has a strong yeast odor. Set the jar in a dark, warm place with the lid off the jar in order to attract the flies. Within a couple of days, you should have a small swarm of fruit flies inside the jar. Take the lid, cut a hole in it and block the hole with cotton or filter floss. Simply place the lid on the jar, capturing the flies, which will breed and lay eggs in the culture media. The larvae will climb up the sides of the jar to pupate, creating more flies. Harvest by placing the jar in the fridge until the flies get groggy from the cold. Then open the jar and tap it, allowing the cold fruit flies to fall on the surface of your tank. The larvae will usually stick to the sides of the jar and you want to leave them there until they hatch. The flies will warm up in a few minutes of exposure to the warm water, so only feed the amount of flies that will be immediately consumed. Leave the jar with the lid on and keep in a warm place in order for the larvae to hatch. When you want to feed more flies, put the jar in the fridge again and extract the flies.
