I let mine molt in the main tank and I will only iso if there is a problem such as another crab dug them up. Though that has become less of an issue with switching to a 75gal from a 20long
![Smile :)](./images/smilies/icon_smile.gif)
I choose to not iso because, honestly, I'm too busy to try and keep track of them. I have mostly little guys and they molt so frequently that if I had to iso for molts I think I would go crazy!