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 fishIn 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 fishin UPGRADE 2 avaiable now! (go to Settings) :* 8 additional aquarium style+ Old tree, + Small roots, + Big old root, + Root with moss, + White root, + 3x new Roocks style* Fishes avoid obscales.In aquartium may sweeem only one type of fish shoal (max 50).Best use for phones.Please comment. Thanks!