Jim, take it from someone with litterally some of the worst luck on this board, you have to look at the positive. Your population increased by 1. I'd kill to have a pup. My only black girl has already swollen up once, saw movement, then nothing. Just like 50%+ of the pregnancies here. Most of mine don't even get to the point of pups and if they do, they die within the first month of being born.
Been at this over 5+ years with rays and I think I've produced that many pups (5).
I've asked for help, I've rebuilt, I've changed everything. I still can't get my rays to produce regularly and I have well over a dozen mature adults.
Don't want to hijack your thread or turn this into a pitty party, just want you to know even though you're going through a streak of bad luck some of us look up to the success you have had. 19 pups? I could only dream of producing that many over the last half decade. That much luck in the first 3 years? I was still struggling to even keep rays alive after the first 3 years.
Keep doing what you're doing, cause whatever you're doing is obviously working. 19 is a hell of a number. Isn't that a pup every other month since you've been doing this? That is VERY impressive.