Nano Aquarium is like natural type aquarium (like Iwagumi ). In aquarium is only one type of fish but this is a shoal of fish. Look, relax and calm down. In Free version : * 1 type of fish * 8 fish in aquarium ( Reset All Settings if you have 5 ) * 1 type of aquarium style * Tap on screen and feed fish In UPGRADED version: * 7 type of fish * 5 to 50 max fish in tank (one type fish) * 5 type of aquarium design * Removed top ads image in settings * Tap on screen and feed fish in UPGRADE 2 avaia