4K Aquarium Tank Video Live Wallpaper is a free personalization app for Android devices developed by 4K4U. It offers a very relaxing and hypnotizing background that users can enjoy on their mobile screens. The app features an ultra HD quality video wallpaper with an ultra-low app size, which doesn't affect battery life. All the materials used in the videos are taken from real nature, and only 4k videos are used. The app also allows users to adjust the frame rate to their liking.

The resolution of the video wallpaper automatically adjusts to fit the screen size, regardless of its orientation. This feature ensures outstanding video quality and performance even on older devices. Users can rate the app on the Google Play store to let the developers know if they liked it. However, the app does not offer any contact information to the developer for feedback or suggestions. Overall, 4K Aquarium Tank Video Live Wallpaper is an excellent choice for users who want to add a calming and mesmerizing touch to their mobile screens.