How much ammonia, nitrite and nitrate is in your tank? They like fast flowing water.
from liveaquaria.com:
"In the wild, this fish (Myxocyprinus asiaticus) can reach up to 39 inches in length; in the aquarium setting they generally reach 18-24 inches.
Due to its size, the Hi Fin Banded Shark requires more advanced care and handling. Therefore, an aquarium with 125 gallons or more of moving, well-filtered, and well-oxygenated water is necessary. Many people find this species to be an ideal algae eater in the backyard garden pond, as the fish can tolerate temperatures as low as 40 degrees fahrenheit.
Peaceful by nature, the Hi Fin Banded Shark is omnivorous, but leans toward the herbivore side of this category, feeding on benthic (bottom-dwelling) invertebrates and rasp algae growing on rocks and logs. Freeze-dried or frozen bloodworms make an excellent diet for juveniles. "
from liveaquaria.com:
"In the wild, this fish (Myxocyprinus asiaticus) can reach up to 39 inches in length; in the aquarium setting they generally reach 18-24 inches.
Due to its size, the Hi Fin Banded Shark requires more advanced care and handling. Therefore, an aquarium with 125 gallons or more of moving, well-filtered, and well-oxygenated water is necessary. Many people find this species to be an ideal algae eater in the backyard garden pond, as the fish can tolerate temperatures as low as 40 degrees fahrenheit.
Peaceful by nature, the Hi Fin Banded Shark is omnivorous, but leans toward the herbivore side of this category, feeding on benthic (bottom-dwelling) invertebrates and rasp algae growing on rocks and logs. Freeze-dried or frozen bloodworms make an excellent diet for juveniles. "