Emerald crab
Emerald crab grows to about 2 in and needs a tank of at least 11 US gal. Here's how to keep it healthy and what it lives well with.
Quick facts
- Water type
- Saltwater
- Group
- Marine invertebrates
- Difficulty
- Beginner
- Temperament
- Semi-aggressive
- Swims
- Bottom
- Adult size
- 2 in
- Minimum tank
- 11 US gal
- Min swim length
- 17.7 in
- Group size
- Fine on its own
Water parameters
- Temperature
- 73–81 °F
- pH
- 8.1–8.4
- Hardness
- 8–12 dGH
Tank & care
Emerald crab doesn't need a group and can be kept singly; choose tankmates to suit its temperament.
Give it at least 17.7 in of swimming length and hold the water around 73–81 °F. Match any new species to these ranges before adding them.
Plan a tank with this fish
Use the stocking calculator to see how many Emerald crab your tank can hold and whether your planned tankmates are compatible — it's anchored to your net water volume and footprint.
Figures are conservative hobby-consensus estimates for planning. Individual fish vary — always research a species and watch how yours behave.
Related guides and tools
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