I have bred my rays but recently on of my motoro's aborted a single baby, she is still very humped at the rear, but there has been no sign of movement.
We will have a look at the link too, we'll update on any developments.
Have you seen Jacks posting of his 5000 (us) gallon tank in the forum. There is a pic of baby motoro. I'll send a photo of the aborted ones if you're interested.