ALL OF THEM ARE ALIVE!!!
That settles it. If ANY of you breed DT, be ready to move them by 3-4 weeks carefully to a fully cycled tank. Float them in breeders boxes or whatever (anything that lets the flow through) or handmake a long holding box if you have a sorority or something. I may give it a try again, maybe. But only if I find another male (or female) soon.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.