Located in Greenfield, Wis., Aquatics Unlimited has a huge selection of tropical and pond fish, marine fish and invertebrates, aquarium and pond plants and aquarium related supplies. It has more than 12,000-square-feet of tropical fish and aquariums and over 350 display tanks. These tanks have more than 3,000-gallons of saltwater and over 12,000-gallons of freshwater. Aquatics Unlimited also tests the customer s aquarium water for ammonia, nitrite, nitrate, pH, hardness, specific gravity and copper and phosphate quantities. The company s supplies include aquarium stands, lighting fixtures, filters, heaters, thermometers, osmosis units, aquarium d cor, foods, books and medications.