Yes, Chunky made it,
he was in his ISO for about a month and a half (or 2), he went under while in there, to molt. His molt was a success, he also regrew his missing limb. I then waited till he was all feeling frisky fine and hardened, then introduced him into the main tank, to his brethren watching him ever so carefully round the clock, as he was so much bigger than his mates. He's doing great! We have 5 total now since his rescue, I tend to their every need and they're all just lovely~