These 6 ft tower aquariums have an adjustable bubble regulator for a fast stream or a slow stream of bubbles. They have a separate switch for the white light to turn them off at night. They have a cover on top, and 2 submersible filters are included. These aquariums hold approximately 12-1/2 gallons of water. I am asking $400. for both of them. I just dropped the price $50.00 These bubble towers originally were priced at $315 each plus shipping. They are available for pick-up and for cash only. Any questions, please reply though Craigslist. Thanks