These little aquarium dwellers tend to swim in a large, single-file cycle going from the far right of the map to the center and back again. On their trip to the center of the map, they tend to stay relatively close to the surface, diving down a bit for the return trip. Am I a professional yet? You can purchase this game on Steam here: http://store.steampowered.com/app/343... Or get the LITE version on Google Play for free here: http://goo.gl/2RC9TU