Ok guys, just a little update. I am amazed to say that in the short time since my last post about this and separating the babies, that the smaller ones have probably doubled in size. I couldn't believe it but it did fix the problem. Thank you all again.
I just set Swordtail's timer for his bath and paused it so I could actually fill his soaking bowl up and he crawled over my phone and canceled the timer
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!