The reason why the noodle doesn't eat may be because the water is changed too often or too much new water is put in at one time. The noodle often has a stress response because of the incompatibility. In this case, the noodle will also refuse to eat.

This situation is the best to deal with, because most of the Excited powder hangers can heal on their own. When the powder hangers slowly get used to the new water, they start eating by themselves.