I have a few pings -- 3 or 4 P. moranensis, P. "Yucca Do 1713", and hopefully soon, a P. x 'Titan'.
They are currently growing under my 4' long grow lights in a windowsill and seem to be pretty happy -- the D. moranensis got a dusting of Crushed, Dried bloodworms recently, as did the Yucca Do, and there are 3 small Moras in one of my new pots.
These are all mexican pings (although the Titan is a hybrid, I think it's half Mexican Ping too?) -- do I need to start thinking about dormancy later this year? The mora got a winter rosette on me (last winter) but was also pretty sickly all winter -- the new plants came from leaves that I pulled off in desperation, thinking the mother plant was doomed.
Any specific tricks to giving them a dormancy? I heard you just cut back on water, a lot. Is that a good plan?