30cm koi fed 10-15 grams per day. Koi is a kind of ornamental fish with large size. Because of its large size, it eats a lot. It must be fed in the process of artificial breeding, otherwise it may fight. This kind of fish belongs to omnivorous fish, and there are many things to eat. Usually, it is mainly fed with animal feed, so it grows faster. It is best to feed it three times a day at intervals.

1. Choose the right feed: To feed koi, you need to choose the right food for them first. It is an omnivorous fish, and there are many kinds of food that can be eaten. There are water earthworms and red worms in animals, green vegetables and bean sprouts in plants, and fish feed purchased from the market.

2. Timing positioning: Feeding koi should follow certain principles. The first is timing, that is, feeding koi at a fixed time every day. The second is positioning, that is, when feeding, you need to choose a fixed place. In this way, after the time comes, koi can concentrate in a fixed position, so the feeding effect is better.

3, eight-point full: Generally speaking, it is better to keep them eight-point full every time they are fed. Specifically, we can take their eating time as a reference. If it is small fish, let them eat it within 5 minutes; If it is a bigger fish, it is better to let them eat it within 30 minutes. However, we also need to adjust according to the season.