Did you know that feeding your pet fish with a lot fish food may kill them?  If you don’t feed them, it would kill them too.   Fish, too, practice the habbit of feeding in moderation.  When my housemate was still keeping fish as pet, and she went away for several days, she asked me to look for her pet fish. I didn’t have idea that when fish was given with fish food that is too much for them to handle, they can be killed due to overeating. They don’t know when to stop eating, that’s why.  It’s up for us  to give them only food that they can take.  One lesson that i was reminded any excess is dangerous.  Same is true for humans, anything taken in excess may be harmful.