"Preparation materials: beef heart (about 4 kg of fat, tendon and membrane, which must be removed bit by bit, but it is very troublesome), fresh prawns (with a high live viscosity of 2.5 kg), squid (5 small), spinach, carrot (one each), spirulina, Jinshikang, Jianwei Xiaoshi tablets (Jiang Zhong children) and six kinds of medicinal vitamins. In addition, the following methods are only my experience, and you should analyze them according to my local situation and the health status of fish before using them.