Kuhli Loaches are the little owls of the aquarium world, staying up all night to clean up the bottom of your tank. You may see them play and move during the day, but once the lights are off they're even more active! The loaches can live up to 10 years, so even though they're tough to breed, you can have them around for a long time. In aquariums, they usually grow to about 3" long, and can be kept in tanks as small as 20-gallons. They are very social and do best in groups of four or more. Fewer,