Thanks for the advice. I never even considered using plastic. All my jade and "pony-tail palms" (Beaucarnea recurvate) are in clay pots and I just assumed that these cactus-like plants needed clay. I have plenty of plastic, about every kind in the world in fact since I propagate so many tropical plants, so moving these Adeniums to plastic is no problem.
That is a huge 9 month old seedling, Ron.