If you want them to try raising their own fry move them to a 10 to 20 gallon tank and add something with a flat surface for them to lay on. Some people use a smooth rock, I use 4" terra cotta drip trays for potted plants. When the wigglers go free swimming feed them BBS right away. The pair prefers something to hide their spawning spot so I usually stick in a plant on driftwood but fake plants would work fine.