Vitamins can improve the health of other cold-water fish as well and, in fact, positively affect the same condition that they do in Koi. Choline, Pantothenic Acid (B6), and pyroxidine: All three of these vitamins are essential for the proper metabolism of carbohydrates, facts, and proteins. Too few of these vitamins cause problems ranging from lack of appetite to reduced growth to internal hemorrhaging.
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