I've been thinking about getting rid of all my fish to try to rid my tank of ich. I've got a big rabbit and yellow belly blue tang. They're kinda buddies having grown up together. They're definitely ick resistant. I'd want those two to stay together.
You'd need to TTM though!!!
A bit of history: I didnt quarantine a white tail properly last year and re-introduced ick to my tank. The rabbit and blue got it real bad. The blue looked like it was dipped in sugar. I tank transferred 4 times and quarantined in a 30 gallon Rubbermaid tub but algae got so bad in my display, I added em back after just a few weeks. That rabbit is a lawn mower!!!
Needless to say, I never got rid of the ick totally and the rabbit has white specks on it from time to time. I know its ick because my mandarin is covered still.
I'd sell both of them together for $125. They're FAT! Fed Thera A and LRS Herbivore daily. Been in a 172 gal for the last 6 months. I'd be willing to let them go 1 at a time for ease of quarantine.