The automatic aquarium feeder can be set to feed regularly and quantitatively, so that you can go out comfortable without worrying about feeding anyone. The moisture-proof device is improved, even if the water vapor in the aquarium evaporates, the freshness and dryness of the fish food will be greatly prolonged. The discharge port of automatic fish feeder can be adjusted and suitable for placing a variety of fish feed, such as pellet feed, particle feed, flake feed, small feed bands, etc. You can choose a suitable feed tank according to the amount of feed to the aquarium, avoid frequent feeds, avoid feed accumulation and humidity. The fixed clip fixed fish feeder is suitable for open aquariums, and the Velcro fixed fish feeder is suitable for closed aquariums. The retaining clip can also be used to secure the water line.