DrTim's Aquatics Re-Fresh Aquarium Revitalizer for Reef and Nano Aquariums, 8-Ounce
Re-fresh for sparkling reef water is a potent combination of beneficial bacteria that work together to maintain clear water, clean aquarium surfaces and eliminate unpleasant odors.  Use Re-fresh to clean extremely dirty aquariums of organic materials.  For reef and nano aquariums. 8-Ounce treats 4800-gallon.