Hi Jaclyn, so great of you to rescue these guys from Wal-Mart. They're lucky fellows and I hope they pull through. Let's see what we can do.
For the SBD fellow: is he showing any signs of bloating? How is his SBD? Does he float on his side at all? What is the dosage of ES? If it's not already at this dosage, I would recommend upping it to 3 tsps per gallon. Have you seen him poop at all and if you have, do the poops look abnormal?
For the little crowntail: So if I'm looking at the pics and reading your description right, the rays of his tail are doubling back so it's almost like they are folded back toward his body? I'm not sure there's anything that can be done specifically for that but I think time will eventually make them unfold. For now, just to make sure he doesn't get a bacterial infection, I'd put him in 1 tsp of AQ salt.
I hope this helps you. Keep us posted and good luck with the little guys.