How Many Fish Should Be in a 55 Gallon Saltwater Tank?
• Step 1:The popular method to determine how many fish should be in an aquarium is an inch of fish to a gallon of water. However, saltwater has less dissolved oxygen than freshwater due to its density. An adequate amount of dissolved oxygen is required to keep the fish alive. The Aquarium Professional Group recommends keeping three inches of fish for every square foot of surface in a saltwater aquarium.
