The automatic fish tank feeder can be set to feed regularly and quantitatively, so you can go out at ease without worrying about anyone's feeding. 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 extended. The discharge port of the automatic fish feeder can be adjusted and is suitable for placing a variety of fish foods, such as granular food, particle food, flake food, small strip food, etc. You can choose a suitable feeding tank according to the feeding amount of the aquarium, avoid frequent feeding, prevent food accumulation and moisture. The fixed clip fish feeder is suitable for open aquariums, and the Velcro fixed fish feeder is suitable for closed aquariums. The fixing clip can also be used to fix the water pipe.