Marina Submersible Pre-Set Aquarium Heater 200W Pressure Flo 2500 They have more capacity than

They have more capacity than most biological filter media and allow ideal water movement throughout the media to ensure optimal contact time for efficient biological filtration

24-hour scheduling to simulate natural solar and lunar cycles

manganous oxide

The proper balance of ultraviolet light (including UVA and UVB)

Marina Submersible Pre-Set Aquarium Heater 200W Pressure Flo 2500 They have more capacity thanPowerful 200 watt Marina Submersible Aquarium Heater provides reliable heating for fresh or saltwater aquariums up to 200 litres (55 US gal) aquariums. The heater includes many practical features for easy use, safety and convenience, including an easy to access temperature set dial, on off pilot light indicator, and a bumper guard for fish safety. Made of durable high impact glass, it's built to last under normal aquatic conditions.