yes if animal gets over weight it can be harmful. over feeding fish can get them fat. if it starts becoming a problem for them to swim and move around things then you should cut back on the food. how many time do you feed them a day and what type of food?
what type of flow is in the tank ? if it's low ya might want to boost it up a bit. do you have pictures of said fattys ? maybe they just have big bones
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