After acquiring all of your aquarium equipment, the following steps will help you assemble it. First, set up the aquarium stand and tank. Thoroughly rinse everything with water before you put it into the tank. Do NOT use soap because soap residue can affect pH levels in the water and harm fish. Next, attach the water filter, and place gravel, rocks, and plants in the tank. When everything else is in position, add water and attach the heater. Then, wait a few days and test the water. When the temperature, salinity, and pH reach their appropriate ranges, you can finally add the fish! Continue to monitor the temperature, salinity, and pH of the water, and clean the tank regularly. Which step should occur after you have balanced the water's temperature, salinity, and pH? A) adding fish to the aquarium B) turning on the aquarium filter C) putting plants in the aquarium D) placing the aquarium on a stand