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Potassium permanganate is good for treatment of fish. It is very important to keep the water clean in fish culture, but it is usually very difficult to regulate the water. We usually add fish lures (betaine) to the fish feed to reduce the leftovers. At same time, we use probiotics to treat water. It is a complex problem.

very interesting this article about the use of organic acids in fish nutrition, i did not hear before. In china ,organic acids are usually added to the pig feed. as for fish , it was very amazing.