D. prolifera can be a pain. Mine were going crazy just a few months ago, but then slowed down, so I moved them to a new, bigger pot. Now, all of the parent plants are dead, and the plantlets are a mixed bag. Some are barely holding on, while others will slowly make one medium-small leaf, then a really small, deformed leaf. I've found cooler temps and lots of INSECT food helps, for some reason.