Description
The Arrow Crab (Stenorhynchus seticornis) is a unique and eye-catching marine invertebrate known for its extremely long, thin legs and pointed body shape. It is a popular addition to reef aquariums due to its unusual appearance and scavenging behavior.
Native to the Western Atlantic and Caribbean reefs, the Arrow Crab spends much of its time hiding among live rock, caves, and coral structures, coming out mainly at night to feed.
Behavior & Diet:
The Arrow Crab is an opportunistic omnivore and scavenger. It feeds on:
- Leftover fish food
- Detritus and organic waste
- Small worms and bristle worms (in some cases)
It can help contribute to tank cleanliness, but it is not a primary cleanup crew member like hermit crabs or snails.
Care Requirements:
- Provide plenty of live rock and hiding spaces
- Stable reef aquarium conditions
- Feed if natural food sources are limited
- Keep with compatible, non-aggressive tank mates
Important Notes:
- Can be semi-aggressive toward small or slow-moving fish and invertebrates
- May prey on small worms and weak organisms
- Not fully reef-safe in all setups—monitor behavior carefully
- Best suited for experienced reef keepers
