How Many Fish in a 55 Gallon Saltwater Tank?
Saltwater stocking is more conservative than freshwater — marine fish need more room, produce more waste, and many are territorial. The calculator below is pre-set to 55 gallons (saltwater); add your livestock and it'll flag reef-safe, aggression, and tank-size problems.
Example 55-gallon saltwater stocking ideas
- Mixed reef: clownfish pair + royal gramma + melanurus wrasse + lawnmower blenny.
- Angel reef (watch corals): flame angelfish + clownfish + six line + cleanup.
- Calm community: banggai cardinals + firefish + diamond goby.
Cycle the tank fully, add the most peaceful fish first and the most aggressive last, and quarantine new arrivals. Run your exact list through the calculator above.
Reef fish for a 55-gallon saltwater tank
Photos via Wikimedia Commons under their respective licenses — click a credit for the source.