How to Make a Saltwater Aquarium for a Crab

There are several types of saltwater aquarium crabs, including hermit crabs and regular flat-bodied crabs. Saltwater crabs help control algae in the aquarium by cleaning surfaces and eating debris. The critters are usually relatively easy to care for, though they do have some specific requirements that need to be met in order to ensure they remain healthy and happy in their aquarium habitat.

Things You'll Need

  • Thermometer
  • Gravel or sand aquarium bedding
  • Aquarium rock
  • Aquarium plants
  • Water testing kit
Show More

Instructions

    • 1

      Purchase an aquarium that provides enough space for the particular crab species you've decided to buy. Each species needs a different amount of space; some only need one gallon per crab, while other species require up to 25 gallons per crab. Make sure to research the particular needs of your crab before you place it in the aquarium.

    • 2

      Fill the bottom of the aquarium with gravel or sand. Many saltwater aquarium crabs like to bury into the substrate of the aquarium, and gravel or sand substrate allows this.

    • 3

      Place aquarium rocks and plants in the aquarium. Most saltwater aquarium crabs need plenty of places to hide. Plants and rocks not only look nice, but also provide these essential hiding spots.

    • 4

      Cycle the aquarium before you introduce any crabs. Cycling is an important step that helps to start the nitrogen cycle. Cycling the tank before you introduce your crabs will ensure that the amount of ammonia and nitrites in the aquarium are at the correct levels for the crabs.

    • 5

      Install a thermometer in the aquarium. Monitor this, ensuring that the temperature remains between 72 and 78 degrees Fahrenheit. Keeping the water at a lower or higher temperature can cause health problems in the crab.

    • 6

      Test the levels of nutrients in the aquarium with a water testing kit. Each saltwater crab species will have slightly different needs, but the pH should usually be between 8.1 and 8.4. The alkalinity should be between 8 and 12.

    • 7

      Place extra shells in the aquarium if you've chosen to keep hermit crabs. Hermit crabs frequently outgrow their shells and need to move into larger ones.