The floating fish grain and the sinking fish grain have their own advantages and disadvantages. The floating fish grain is generally expanded material, which is suitable for the fish in the upper layer. The sinking fish grain is cooked material, which is easy to be sucked away by the filtration system. Usually the feed must be clean and sanitary, and the live bait needs disinfection. At the same time, the size of the feed should be appropriate so that the fish can not enter the mouth. In addition, we should also ensure that it is rich in nutrition and easy to preserve, so as to avoid its deterioration and mildew. 1、 It is better to float up or sink down. There is no good or bad difference between fish grain floating up and sinking. It is usually selected according to the feeding habits of fish. Generally, the floating is expanded and the sinking is cooked. It should be noted that if there is filtration at the bottom of the fish tank, the sinking feed is easy to be sucked away, so it is only suitable for feeding floating feed. 2、 Feed standard 1. Cleanliness and hygiene: for fish, most diseases in feeding go in from the mouth, so we must pay attention to the cleanliness and hygiene of feed. If it is artificial feed, it is very safe without special treatment, but if it is fed with live bait, there will inevitably be bacteria and parasites in it, which can only be fed after detoxification.
2. Suitable size: different kinds of fish have different sizes, so pay attention to the size of feed. If the feed is too small, the fish can't see it, and if it is too large, it can't be swallowed. And feed into the water, it is best to maintain the original shape within a day, do not use the feed scattered after entering the water, otherwise it will pollute the water quality.
3. Adequate nutrition: if the nutrition of fish feed is enough, it will also be reflected in the growth of fish. If the nutrition is single and the taste is general, fish are easy to be picky. If a variety of nutrients can be supplemented, the fish will grow stronger, suffer from much less diseases, and help its hair color.
4. Convenient storage: another problem of fish food is how to save it. Pay attention to the shelf life of artificial feed. If it is self-made feed, it's best not to do too much. After completion, the excess can be stored in the freezer layer of the refrigerator, but don't put it too long. （YuLiangShangFuDeHaoHaiShiXiaChenDeHao，ShangFuHeXiaChenLeiXingDeYuSiLiao）