How to raise black Mary fish?

If there is only one fish in the aquarium, a quarter of the computer keyboard should be enough. If you want it to reproduce, you can. There is no need to put aquatic plants in the aquarium. Is not eating a water quality problem? Can't use tap water directly. Tap water needs to be left to dry for a few days, just let it stand for two to three days, twice a day and eat it all in three minutes. . . If the fish is in a bad state, the frequency can be reduced. Domestic fish have been artificially screened and specially used for viewing. Ornamental fish are generally small in size and have a small relative food intake. In addition, life itself is very fragile, eating too much will kill you, and it will also pollute the water quality! ! !