So far I have left all three of mine alone for a week to get them acclimated no matter how hard it was to do, so I can't speak about that. I have seen some people that say there BP seemed ok and fed them 2 days after getting them home with no ill effects. There's really no way of saying for sure that nothing will or won't happen and you may end up beating yourself up because your new BP is stressed out and roams around it's tub all the time and then won't eat. Again not saying it will or won't happen because each one is different.