Can I feed my koi fish tomatoes?

Yes, you can feed your koi fish tomatoes, but they should be given in moderation and prepared properly. Remove the skin and seeds, and chop the flesh into small pieces to make it easier for the fish to consume. Tomatoes are high in water content and can provide some vitamins, but they should not replace a balanced diet formulated specifically for koi. Always monitor your fish for any adverse reactions when introducing new foods.