Co2 Aquarium Shop

Co2 Aquarium Shop is an aquarium supply store in Mong Kok, Hong Kong, located on the floor above Kam Wa Bing Cheng, by the left entrance where people line up for pineapple buns. It sells ornamental fish supplies, and staff explain how to use items after purchase. Opening hours are 13:30 to 21:00, so it can be visited in the evening. Staff also answer questions about aquarium problems even if nothing is bought.