A starfish has five eyes. Starfish has an eye on each wrist, which is located at the end of the wrist foot and is a red eye spot. Compared with the eyes of higher organisms, the eyes of starfish are simple in structure. They belong to compound eyes, but they are different from the compound eyes of insects. Their structure is very primitive and there are no crystals in their eyes, so they can't distinguish the surrounding objects well. Although they have imaging ability, their resolution is very low.

1. Container: You can raise starfish in fish containers. It is best to put some other things in the container, such as coral, gravel, etc., or directly build a cave for starfish, so that starfish can live in it.

2. Water temperature: Water temperature is an important factor in breeding starfish. Starfish like to live in warm water, so it is appropriate to keep it between 26-28 degrees. Therefore, special attention should be paid to regulating the water temperature in the process of breeding. If the water temperature is low, tools such as heating rods can be used.

3. Water quality: Water culture is needed to cultivate starfish, and attention should be paid to the water quality used. Starfish originally live in the ocean, so it is best not to use fresh water for breeding. Moreover, starfish should not be left out of water for a long time.

4. Change water: Starfish has strong disease resistance and seldom gets sick at ordinary times. However, it is also necessary to keep the water clean. If you don't change the water for a long time, the water quality will become very dirty, and the bacteria in it will breed in large numbers. At this time, starfish will also have bacterial infection, and if it is serious, it may die.