Invertebrate:
Halloween moon crab
Hartnollius quadratus
formerly Gecarcinus quadratus
Freshwater
Marine
Adult size10–10.2 cm
Tank76 L or more
Care levelIntermediate, advanced
Will it fit your tank?
Compare it with your tank's species, size, water tests and country.
Water
Temperature23.9–32.2 °C
5 °C35 °C
pH7.0–8.0
49
Salinity12–33 ppt
0 ppt40 ppt
- Comfortable
- Acceptable, less ideal
- Tolerated, not comfortable
Space
Tank volume76 L
Needs 60–151 L, depending on how it is kept
- The space it needs, from the least to the most generous
- Recommended
Character and care
- TemperamentUsually aggressive
- Social lifeSolitary
- DietOmnivore