Hi,
If by 'white worms' you mean Enchytraen worms?
I used to culture these and feed them to my Discus fish which usually induced them to spawn. Get yourself a starter culture from a reliable source, you can find them on ebay and the supplier usually provides a set of instructions on how to culture them, but just in case.
Get yourself some shallow wooden crates, the kind you see fruit and vegetables in on the market or superstores. Buy some light soil based compost, some perlite, from a garden centre (not vermiculite) to keep the soil aerated and some very fine horticultural sand. Mix the compost 3 part soil to one part sand and one part perlite until you finish up with a fine loamy sandy soil mixture. Add just enough water to dampen the mix not saturate it. Fill the box with about 2 and half inches to 3 inches of the sandy soil mix. Make sure the mix is not clumpy, it should not be sticking together even when it is damp. If it goes clumpy add a bit more sand and perlite. Once you get your culture just tip the worms out on top of the soil and let them find their way into the soil.
To feed them you can use a variety of things but the important thing is not too much of anything at once. I used milk based baby food, soft flakes or you can use the cereal 'Ready Brek' Get hold of some spirulina powder and a fine vitamin powder, mix them both into the flakes, but don't over do it, add a little water and a stir into a paste until smooth. Spread this paste thinly in an area about two to three inches over the centre of the soil. The worms will come to the surface and ingest the paste with the vitamins and spirulina which will be passed onto your fish when you feed the worms to them.
Keep doing this until the worm culture has increased in population, at least three times the amount you started with, to the point where you can start harvesting them. Keep the boxes in a shed or garage out of direct sunlight, it is important not to let them overheat in the summer or get too cold in winter, room temperature all the time. You can also use vegetable matter blended to a pulp and do the same thing. Do not feed meat products of any kind.
Have a second box set up and ready to go after about two weeks ready to start another culture. You can keep the first culture for about one month, you will know when it is time to get rid of the old soil mix because it will start to smell with an ammonia type smell from the build up of waste matter from the worms. This will wipe out the worms if kept in there long enough so be warned.
To collect the worms you can either scoop out a chunk of the soil and place it in the centre of a shallow plate and place the plate into warm water, this drives the worms to the surface to escape the heat source and you can then collect them quite easily, give them a quick rinse to remove any soil and away you go. It is a bit of messing around at first but I found the effort was worth it for the benefits I saw in my fish. When feeding them to the fish use a plastic tubifex worm feeder floating at the surface, don't just chuck them straight in to the tank as they will disperse, any not eaten will attempt to bury them selves in the substrate but they will drown and that is not good, it is also a waste of time and effort.
Good luck,
Steve
