So, I never did get around to setting up the 20 gal as a growout. I'll definitely get it up and running for my next spawn. =) Mom is still coexisting peacefully with the fry still in the tub, and well as an ever increasing number of guppies. I did find a new way of controlling the guppy population, though! My VT boys love guppy fry, apparently, and hunting something so fast is a great way to get them some exercise.
Babies will be 12 weeks tomorrow. #1, a pretty red boy, flared last night! I need to do another large-ish cull, mostly runts not doing well in the growout and deformed/weak jarred fry that aren't going to have a good quality of life. This spawn is still looking to be mostly male. If there isn't a nice female that I could breed somewhere in there, I'll be looking for a (hopefully related) girl, preferably yellow, to breed with one of these boys in about 2 months.
Solstice - cellophane HM female