Can you add some syrup to the fish tank?

Not so good. Different creatures have different feelings about different substances. For example, if birds eat insects, humans will feel bitter and disgusting. If dung beetles eats shit, human beings can't eat it. If horses eat straw, humans don't like it. Humans like sugar, but fish don't. In addition, sugar can lead to the death of some scaleless fish, such as scavengers, rays and loach. Because of the osmotic pressure of sugar water, the water in scaleless fish will be sucked out. For goldfish, koi fish, arowana, and so on, adding sugar is really not afraid. But it's worthless, which means it's a meaningless thing. It seems it's almost evening 12 o'clock. I am at home. Now I can go downstairs and shout "Long live the people and the country of China". Nobody knows me either, but it doesn't make sense, so I won't do it. Adding sugar is the same behavior. And if sugar water is added, it will be nutritious and will breed algae and bacteria. Affect the health of fish and the beauty of fish tanks.