How to feed Koi and Goldfish, including winter feeding, what how and when to feed Koi. All about feeding Koi.
Koi Feeding - Feeding Koi - Detailed Information about Koi Feeding

FEED YOUR KOI
Medicated Food. An excellent way to get antibiotics into swimming fish you couldn't catch or handle; but only if htey need it. Medikoi is a very good one, probably the best. Aquameds.com
VITAMINS IN KOI FOOD - VITAMIN C FOR KOI
Vitamins

Important ones seem to be fat soluble A,D,E and K - and vitamin C.

Vitamin deficiencies from missing vitamins are comparatively rare in the last two decades. This is because vitamin premixes exist in the processing of fish food that have eliminated most of the mystery and a lot of the onerous expense. Vitamins A,D,E and K when deficient result in lesions of the skin, eyes, and nervous system. Vitamin K contributes to blood clotting. How much this bears on fish is vague at best.

Vitamin C is not so mysterious. Addition of Vitamin C to the diet of Koi and Goldfish is a "Good Thing" for several reasons. First, it's essential to the fish and contributes majorly to disease resistance. Second, food processing degrades Vitamin C so that enough of this has to be added to the food to where a surplus survives the processing of the food. Inattention on the part of the feed manufacturer to this could result in food too low in Vitamin C. Finally, if available over 180 milligrams per kilogram, some research supports that the immune system is not only supported, but dramatically enhanced.


FISHMEDICINES

Fish Medicines
Learn about fish medicines, what they do, and where to get them.





Aquameds.com
Do you have a business that markets fish medicines but you want to be sure you're getting a good price, good information, and trusted support? Aquameds has a full product line for your business.

Koi Beginner
Once you've leapfrogged through this tutorial you will have a solid, working concept of the Koi hobby and what it's all about. This is done just about exclusively with video and very little written material.

Fish Medicines
Learn about fish medicines, what they do, and where to get them.

PondCrisis.com
If you have a koi, pond or fish problem, this site takes you through twenty easy questions and at the end you know what you need to fix in your pond to create restored Koi health.

KoiCrisis.com
Koi Crisis has a symptoms chart by system you can choose the symptom by fish part, and resolve a lot of Koi pond fish problems or at least, learn about them understand how to remedy them.

Koi Food & Feeding
What should you feed your koi? How many times per day? Is Corn really that bad in a Koi diet? What are the most common feeding mistakes people make? What's the best food?