How can I put my pet fish on a diet?

my mom over feeds my fish. she feeds them multiple times a day, every day.
they are extremely obese, as obese as a fish can get.
I am worried they will suffer impaction, swim bladder disease and other complications.

How can I "diet" my fish?? I love my fish, I don't want them to die.

I have betta fish and cory cats.
 
tell her to stop feeding them so much. feed once a day or a very small amount twice a day and skip one day a week. they'll look normal soon enough, fish don't lose fat like people do, they just need to pass the extra food in them
 
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