The one that I wasn't sure if she was sick or not still looks fine. The one that was dying is now not dying, but is still the skinniest fish I have ever seen swimming. I think she might have put some weight back on but I'm not sure. At any rate the treatment is working because she would be dead by now otherwise. The water is now solid purplish red. The scummy foam on the surface has collapsed, bubbles from the aerator last longer than they would in clear water but I can get food in easily now. I fed some high protein betta pellets earlier and I'm giving them more frozen peas later. The tank is basically barren and they must be quite bored (I didn't want to put the medication in the main tank and wipe out the cycle bacteria, just when I'd convinced them to grow back) so peas are good. It took them a few hours to demolish the last one and they were at it every time I went in. I'm glad Stryker's got her appetite back, she stopped eating for a day. That's what made me so certain I would lose her, because she has never done that to me before. She was the only fish that would still eat when that contaminant got into my tank a few months ago and poisoned them all. Both the fish that are sick now survived that, but none of the other fish that survived that are sick so it's not some delayed poisoning. Besides, it was ages ago.
Thanks for the help. She's not out of the woods yet but she is hanging on so fingers crossed...