GBTA

[mws]

You should wait as long as it takes for it to be happy. There is no point to feed an upset nem. If the tentacles are not sticky food will probably irritate it even more and you will be to square one again. Some people never feed there nems, food is not something it required daily.
Don't touch it, let it find a spot it likes, even if it doesn't looks like a good spot to you. When they stressed, they will move to a spot with no light at all. When my nems split, some will go to heal into shaded area and move out when feeling better.