Tank setup
A minimum 80L aquarium suits Blue Knuckle Hermit Crab. Match décor to natural behaviour — plants, rockwork, or open swimming room as needed.
Where to buy
Compare prices from SA aquarium shops listing Blue Knuckle Hermit Crab.
Avg. price
R95
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Overview
What to know before you buy.
The Blue Knuckle Hermit Crab is a visually stunning invertebrate, featuring brilliant electric blue legs with black banding and bright orange antennae. It is an effective scavenger, feeding on detritus and some algae. It is generally considered 'reef-safe with caution.' While it typically leaves corals alone, it has a reputation for being more aggressive than other 'reef-safe' hermits, like the Scarlet or Blue-legged. It may attack snails for their shells or bother corals. It is a fantastic showpiece for a reef tank, provided it is well-fed and ample spare shells are available. Its bright orange antennae are constantly in motion, 'tasting' the water.
Key traits
semi aggressive
small
easy
scavenger
omnivore
crab
Compatibility
Select a tank to see how this species fits.
Care guide
Everything you need to keep Blue Knuckle Hermit Crab healthy in a South African setup.
Water parameters
Keep pH 8.1–8.4 and 24–28°C. Stable parameters matter more than chasing perfect numbers — acclimate new arrivals slowly.
Feeding
Blue Knuckle Hermit Crab is scavenger. Feed a varied diet appropriate for invertebrates — quality flakes, pellets, or frozen foods sized to the mouth.
Behaviour
Blue Knuckle Hermit Crab is generally semi-aggressive. Observe during feeding and at lights-out for true temperament.
Tankmates
Pair with similarly sized semi-aggressive tankmates in invertebrates. Avoid fin-nippers or species that outgrow this fish.
Breeding
Breeding notes for Blue Knuckle Hermit Crab vary by line and water chemistry — ask your local shop about proven pairs in SA.
Keeping invertebrates?
Invertebrates read water quality more sensitively than fish — condition and test rather than guess.
Availability confirmed with the distributor before dispatch · free delivery over r750
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Market intelligence
Price trends and buyer demand — data only FishHub tracks.
Price history — last 90 days
SA price range this month: R40–150 · Average: R103
This data is unique to FishHub
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