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 Eliminate C) putting plants in the aquarium D) placing the aquarium on a stand

It depends on the order that you knew you wanted. For example, if your aquarium's water has already been adjusted, maybe you don't want a stand, so not D. You would normally put plants in first, so not C. A. could possibly come next, but if you'd rather have a filter in before that, your answer would be B.