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Red Claw Crab
Perisesarma bidens
A charismatic crab with vivid red claws that needs brackish water (SG 1.003-1.010) plus a 50-70% land area to climb on - it is not a true freshwater species despite how stores sell it. Feisty with slow tankmates; keep one per tank and cover every escape route.
Care Parameters
Water type
Brackish
Adult size
4 cm
Temperature
24–28°C
pH
7.5–8.5
Diet
Omnivore
Group
crab
Temperament
Semi-aggressive
Difficulty
Intermediate
Common Problems
3T
Temperature Shock
Sudden temperature swings after water changes, heater failure or power cuts stress fish.
fishF
Fish Gasping at Surface
Fish hover at the surface, breathing rapidly. A possible oxygen emergency.
fishD
Dropsy
Abdomen swells and scales stand out like a pinecone — usually a bacterial infection.
fish