Microworms are small (0.5 - 1.5mm.) nematode worms, which make excellent supplementary live food for fry which are either too big for infusoria or have outgrown the infusoria stage. They are also great secondary food for sub-adult fish or even adult fish of small growing species, particularly those with small mouths. Micro worms are very easy and cheap to cultivate and I have had good results over many years.
My preferred mix is one cup of quick oats to one and a quarter cups of warm water. Mix thoroughly and pour into a suitable container. I use white plastic two-litre ice cream containers. (Note that the mix is not cooked.) Allow cooling, and then seed the mix with worms, putting the lid on and leaving in a cool place.
The worms will multiply rapidly and after a couple of weeks (less in warm weather and longer in cool weather) the worms come out of the mix and crawl up the sides of the container. When they do, you just wipe them off with your finger and stir them into the top water of your aquarium. They will gradually sink but I don't believe that many get to the bottom - they wriggle like crazy in the water and the fish really gobble them up. I keep several cultures going and give my fish a feed every morning. Occasionally I give the mix a gentle stir - this seems to activate the worms and the next day there is a larger than usual crop on the sides of the container.
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