How do i make sure all my fish eat properly?

Divad

New member
I have 1 Betta and 3 black mollies in a 20 gallon tank. Every time i lift the hood the betta is the first one there all the others are just at the bottom or swimming about. Now my betta is bloated because he eats all the food. How do i make sure that the mollies are eating well?
 
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