I ended up keeping the female pup. She is now about 4.5" dia and doing well in the main tank. The male pup lives in SD.
On a side note, I checked the tank this morning before work and noticed it was really cloudy. The 4 line pictus cat was extremely fat as well. I thought maybe the female ray had aborted a pup during the night and the catfish ate it, although she showed no signs of being pregnant. When I got home this afternoon, I noticed a sperm plug in the tank and some bite marks on the female