Well, apparently I spoke too soon!
After weeks of not seeing any babies, today I see 5 babies in the tank!
They are about the size of half grown cherries. I tried to get some pics, but everything is blurry so far.
Something interesting to note, although I have pvc in the tank, the male has chosen to dig out a burrow under the hair algae (that I've used instead of moss). Don't crays do this, too?