We have been monitoring their growth daily and surprisingly they have been very easy to raise. They hatched after just a couple of day, slipping free of their slimy bonds, looking like dormant little black rectangles. Day-by-day they have grown, their various stages and structures surprisingly evident to the naked eye. We transferred them to an aquarium and as of today they have a distinct head, external gill, and tail. They hold onto vegetation with a sucker.
Training the little children to keep their fingers and other objects out of the tank is a slight challenge, but they are handling it well so far.