Another section of our discus fish hatchery. These aquariums are on a central system. Water flows in and out of each aquarium and back to a large reservoir. The return water is then pumped into a swimming pool sand filter and returned to the aquariums. We have 7 large central systems at our discus fish hatchery. Just call 410-356-7557 a day in advance to set up an appointment to visit our discus fish hatchery.