Grindal worms are a tiny relative of the common earthworm. Much larger than microworms but only a fourth the size of the harder to keep Whiteworms. Grindals are about half an inch long and as big around as a piece of thread. They make excellent live food for growing fry and conditioning breeder adults of smaller species such as Guppies, Tetras, Danios and Killifish. They are also greedily eaten by even bigger fish.
All fish benefit from some live food in their diet.
Grindals live and reproduce well at normal household temperatures, take up very little space and are easy to culture. The worms surround a splotch of food Toothpick for size comparision Culturing Grindal Worms Materials Needed Culture Box - small plastic container with lid, such as a cleaned margerine tub. Potting soil, enough to fill the container to a depth of about one inch. A Culture Put up to an inch of potting soil into your culture box, give it a good squirting with your mister, wet it to about the same moisture content as freshly turned dirt. Punch a few small holes in the lid for ventilation.