You can feed the fish tank after changing the water for half an hour. Because after changing the water, the fish will be stimulated to a certain extent. At this time, they often stop eating when they are full. When the water quality is stable and it adapts, they will eat when they are fed. Besides, don't change too much water. Fresh water can cause some stress reactions of fish, which has a great influence on their health. 1. How often do you feed the fish tank after changing water? You can feed it in half an hour after changing the water. Because after changing the water, the fish will be stimulated to a certain extent. At this time, they often stop eating when they are full. When the water quality is stable and it adapts, they will eat when they are fed. Besides, don't change too much water. Fresh water can cause some stress reactions of fish, which has a great influence on their health.

Second, how to feed the fish 1, feed selection: First of all, you should choose the right feed to feed the fish, because different kinds of fish have different feeding habits. Herbivorous fish like to eat plants, carnivorous fish mainly eat fish and shrimp, and omnivorous fish can do it. In addition, there are filter-feeding fish, which need plankton as feed.

2, feeding time: As a temperature-changing animal, the appetite of fish is often affected by temperature, so don't feed at night. Feeding time is usually after 9: 00 in the morning and before 4: 00 in the afternoon. If it is winter, the time should be further shortened to make the fish eat happily.

3, precautions: feeding fish must pay attention to the amount of food, do not feed too much, so as not to suffer from enteritis and other symptoms. In addition, when changing water for fish, it is best to clean up the unfinished food, which can prevent the water body from being polluted and is of great help to the health of fish.