D. adelae can sometimes be somewhat of a mystery. It is said to be very easy, which it is, but from my experience it doesn't like being disturbed. I grow mine as a windowsill plant, and they do quite well. When I first received mine, they were in a huge clump, which I promptly separated, which also caused them to lose are their dew. It would not come back. Old leaves which have lost their dew on this plant, seem not to get 're-dewy'. I would make the same suggestion as wise xvart has. It may sound drastic, but the results are stunning. I chopped half of my plants off at the stem, and left the rest. Where the stumps where, now 3-4 weeks later are some smaller plantlets which have sprung from the roots. They are all growing extremely fast and of epic proportions. Although it may sound drastic, just chop them off, and wait, while giving them the same normal conditions. As the Beatles once said, "you know its gonna be alright."