Aquarium Testing Equipment
You will need some combination of aquarium testing equipment to make sure conditions in your aquarium stay healthy and stable. Every aquarium needs a thermometer. Saltwater aquariums need a hydrometer or refractometer. And different aquariums need different combinations of test kits to monitor alkalinity, naturally occurring toxins (like ammonia), and vital elements (like oxygen). Make sure you have the appropriate testing equipment for your aquarium.