Nano fish, measuring less than 1.5 inches, are an intriguing group of aquatic pets perfect for small aquarium hobbyists. Petite species like the Celestial Pearl Danio and Neon Stiphodon Goby thrive in tanks as tiny as 3.5 gallons, thanks to their small size. Despite their diminutive size, these fish add a dynamic presence to any aquarium with their vivid colors and lively behavior. The Indonesian Superdwarf fish, known as one of the world's tiniest fish species, grows just over a third of an inch. These tiny fish are not only visually appealing but also enhance the biodiversity and ecological harmony of their small aquatic environments. They are ideal for anyone wishing to establish a tranquil underwater realm on a modest scale. For nano fish smaller than 1.5 inches, it's critical to maintain proper water conditions for their health. Here are some general guidelines for optimal water parameters: Temperature should be between 75.2°F and 80.6°F (24°C to 27°C). The pH level should range from 5.5 to 7.0, accommodating various nano fish species. Water hardness should be between 5 to 16 dGH (degrees of General Hardness). Remember, these are broad recommendations, and individual species may have specific needs. Always conduct thorough research on the particular requirements of your nano fish to provide them with the best care possible.