Separating is only necessary If other rays are causing her stress. Sometimes males won't stop going after them after the job is done. I have never fed extra to a pregnant female. As long as u give them plenty everyday anyway that has been enough for mine. I do feed them extra right after they give birth for a week or two to fatten them back up though.
You're welcome. I don't dose unless it's quarantine for a wild caught ray, or I know there is an issue for sure. So I don't have an answer for u man. I'm sure someone else with expirience about meds and pregnanr rays can chime in. Might be info in the sticky threads also?