Feeder Gold Fish are often nutritionally deficient as purchased from the stores but more importantly they contain an enzyme called thiaminase which destroys vitamin B (thiamine). Lack of vit B will cause neurological disorders.
Minnows like Guppies and Fathead Minnows (Rosy Reds) contain trace amounts of thiaminase but not enough to be harmful. If you could get it to eat frozen thawed trout that is good also.
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