Get an open handled plastic pitcher (I had to hunt high and low for them). Fill it with 100% RO and put it inside the breeding tank with a bubbler. When the parents spawn, wait between 30 minutes and an hour then put the cone in the pitcher. When little tails start to wiggle start changing their water with the parent's water. Once the wigglers leave the cone and free swim, pour the little ones in the tank with their parents.
The pitcher has to hold a gallon. That's why it was so hard to find. I finally found some on line at a restaurant supply place. They must have thought it strange that I only wanted 3.