all stressed fish stop eating from one day to even a couple of weeks in captivity. I have 4 full grown madtoms in my 29 gallon. Their not even 6 inches long so taking care of them is a piece of cake, I also always give them live food that they ate in the wild( i catch their food from the same place i got them). When I first got them they werent even a month old and they didnt start to eat for a while.
Anyways, what I would do in your case is to put baby guppies in there. When they are hungry and ready, they'll eat them. That's your indication that they are ready for feeding. |