To clean the intestines of Tubifex worms from various pathogens after purchase, you need to:
• To clean the purchased Tubifex, keep them in a cool place for 5-6 days, washing them every morning and evening. You can wash them in a glass jar under tap water, draining the muddy water and stopping the wash when the water becomes clear. During this time, the worms release a large amount of bacteria contained in their intestines into the water. By the sixth day, the worms usually acquire a pinkish color and practically stop releasing the black silt-like mass.
• Some hobbyists “soak” Tubifex in milk, which also needs to be changed.
• Place the Tubifex inside a piece of nylon stocking (or gauze), tie both ends, and place it in a wide container filled with fresh water (water layer 1-3 cm). Soon the worms begin to crawl through the fabric of the stocking and gather in clumps around it. To speed up this process, place a vessel with warm and then hot water on top of the stocking containing the Tubifex. The warm water causes the worms to move to the peripheral areas of the stocking, and then, escaping the boiling water, they immediately crawl out of it into clean water.
• Take two metal cans of different diameters. One should fit inside the other with a small clearance between the walls. Pour hot water into the larger can, and place a layer of uncleaned Tubifex into the smaller one, covering it tightly on top with a single layer of moistened gauze. Then lower the smaller can into the can with hot water. The level of hot water should be slightly below the level of the Tubifex. Escaping the heat, the worms crawl out onto the surface of the gauze. From there, they are periodically collected with tweezers or a fork and placed into a container of cold water.
• Pour thickly brewed starch into the vessel with Tubifex. All the worms gather on the surface of the starch in a dense ball; the starch remains beneath them, and an even lower layer contains the dirt that came along with the worms.
• An intensive express method for cleaning Tubifex within 24 hours is known. Place the Tubifex into a tray without water and add 1-2 spoons of kefir, which they consume and thus clean out their intestines.
How to store Tubifex for feeding fish.
• Storing live food for a long time is not recommended. It is best to store Tubifex in small clumps.
• Keep them in a tray or jar with a water layer of no more than 0.5-1 cm at a temperature of 5-10°C (in the evaporator and upper compartments of the refrigerator they usually freeze and die), washing them at least twice a day under tap water, draining the muddy water and stopping when the water becomes clear.
• It is best to keep Tubifex in running water, for example, in a toilet tank.
• Some people keep worms (and even breed them) in water containers at a temperature of about 15 degrees. Coarse sand is placed at the bottom of the container. Almost any organic matter serves as food for the worms — a small amount of bread, dry fish food, etc. The food should be placed at the bottom or buried in the sand. You should feed them so that only a small amount of decaying organic matter is present in the container — approximately once every two weeks.
• See methods for storing bloodworms. 
You can store them using all similar methods.
Transparent phantom midge larvae. Corethra – Corethra.
Oligochaete worms. Tubifex, Tubifex worm. 
