The Blue Zebra Borneo Sucker Loach, scientifically known as Gastromyzon sp. “SK3,” is a beautifully patterned and highly specialized freshwater fish native to the clear, fast-flowing streams of Borneo. This species embodies the remarkable adaptations of hillstream loaches, thriving in environments where water movement is strong, oxygen levels are high, and smooth rocks dominate the riverbed. Its combination of vivid coloration and fascinating behavior makes it a standout species for aquarists who enjoy natural river-style aquariums. The body of the Blue Zebra Borneo Sucker Loach is elegantly flattened, perfectly designed to anchor itself against rocks in swift currents. Its coloration is a striking interplay of deep blues and silvery tones, overlaid with darker horizontal or zebra-like bands that give it a bold, distinctive appearance. Under good lighting, subtle iridescence can be seen across the fins and body, highlighting the blue hues that give the species its common name. In aquariums, this loach thrives in setups that replicate its native mountain stream habitat. A substrate of smooth stones and fine gravel provides the perfect surface for grazing, while strong water flow and high oxygenation are essential for their health. Cool, clean water conditions are vital, and a powerful filter or circulation pump helps maintain the current they prefer. Hardy plants like Anubias, Bolbitis, or Java fern can be included, though most of the tank should remain open and unobstructed to allow natural movement and foraging. The Blue Zebra Borneo Sucker Loach is peaceful and social, doing best in small groups of its own kind. When kept together, they display interesting group interactions such as synchronized grazing and occasional gentle chasing, behaviors that are both natural and engaging to observe. They also make excellent community fish, coexisting well with other calm, cool-water species such as danios, rasboras, and other hillstream loaches. Feeding should reflect their natural diet, which consists mainly of biofilm, algae, and microscopic organisms found on rocks. In the aquarium, they benefit from a mature setup with natural algal growth, supplemented with sinking algae wafers, blanched vegetables, and small amounts of protein foods like daphnia or bloodworms. Providing a varied diet helps maintain their color and vitality. Breeding Gastromyzon sp. “SK3” in captivity has not been widely documented and is believed to require very specific conditions, including environmental cues such as changes in water flow and temperature. Most individuals in the aquarium trade are captive-bred through specialized breeding efforts or occasionally wild-collected. The Blue Zebra Borneo Sucker Loach is a truly captivating species that brings the tranquil energy of Borneo’s mountain streams into the home aquarium. Its shimmering blue tones, peaceful temperament, and fascinating adaptations make it an exceptional choice for aquarists dedicated to maintaining pristine, well-oxygenated environments that showcase the beauty of river life.