Insaniquarium

Insaniquarium is a puzzle video game created by American studio Flying Bear Entertainment and published by PopCap Games. Insaniquarium Deluxe features pets, various modes of gameplay, and a type of currency called "shells". Shells are collected as the game progresses, and they can be used to create a custom Insaniquarium screen saver, to buy bonus pets or to increase the number of pets allowed in each tank.