I have a rubbermaid compost bin I use and breed red wigglers. As others posted theyre not aquatic but its a cheap route. I plan on feeding my bluegill tank with them. Plus they eat my kitchen scraps. Ive bred black worms at my old job at a lfs. We kept them in a small plastic container in the fridge and changed the water every day. Then we used a turkey baister to feed the fish.