This is a test of commonsense. Complete the next sentence:

How to set up an aquarium
Decide if you want a freshwater aquarium or saltwater aquarium.
There are many differences between having a freshwater aquarium versus having a saltwater aquarium. These differences include how you initially set up the aquarium and all ongoing care, maintenance, everyday chores, and costs requirements.
There are several key issues you will need to consider while you choose : Saltwater aquariums cost more. Saltwater aquariums have specific water requirements that need extra tools and equipment to maintain it, as opposed to maintaining a freshwater aquarium.