Worm harvesting is a very simple procedure. Wait until the worms are climbing the container walls and you will be able to collect them by running your finger around the walls. If you find this method a little unpleasant, then you can use a small stiff brush. The worms can then be fed directly to the fry by swishing your finger or the brush in the aquarium water. Do not dip the brush in the culture medium to collect worms, as any medium rinsed off into the aquarium will only pollute the water. Another method of harvesting is to lay wooden ice-block sticks on the surface of the culture. The worms will crawl onto the sticks and you can then swish the stick in the aquarium water.