How Long Can Aquarium Fish Go Without Food. You can rest assured that your betta fish will easily go a week without eating if youve been feeding it with healthy food in the right amounts. No food in any tank for three days.
To answer your question most but not all fish will easily live for two weeks without food. Typically a betta fish can survive without food for up to 14 days but thats like pushing the boundaries. Therefore the recommended time you can leave your fish without food is 4 or 5 days.
Herbivores that eat daily will suffer more than carnivores that tend to eat only every few days.
The general rule is that the bigger and older your fish is the more likely they are to survive without food for a longer period of time. While thats the maximum length of time there may be variations from one fish to another. The same is not true for molly fry which can only survive up to 3 days without food. Omg thanks so much for telling me that.
