Sexy Shrimp

Discover the Sexy Shrimp (Thor amboinensis) Small in size but massive in personality, the Sexy Shrimp (Thor amboinensis) is one of the most entertaining and visually striking invertebrates you can add to a marine aquarium. Also known as the High-Backed Shrimp or Dancing Shrimp, this tiny crustacean gets its memorable common name from its unusual, rhythmic walking style. Key Features & BehaviorsThe "Sexy" Dance: These shrimp walk with their abdomens arched high over their heads, constantly swaying their tails back and forth in a mesmerizing, rhythmic dance. Biologists believe this movement helps break up their silhouette, making them harder for predators to spot against moving anemones and corals.Anemone Symbiosis: In the wild, Sexy Shrimp share a commensal relationship (a partnership where one benefits and the other is unharmed) with sea anemones like the Carpet Anemone (Stichodactyla) or Bubble Tip Anemone (Entacmaea quadricolor). The stinging tentacles protect the tiny shrimp from hungry fish, while the shrimp cleans up debris around the host.The Perfect Nano-Reef Resident: Because they max out at just over half an inch, they are the gold standard for nano and pico reefs (ultra-small aquariums under 10 gallons). They have a negligible bioload (waste impact) and won't outgrow small setups. Strength in Numbers: Sexy Shrimp are highly social. While a single shrimp will likely hide and become invisible in a tank, a small colony of 3 to 5 will gain confidence, hang out together on their favorite coral, and dance constantly in plain sight. Species Profile Feature Specification Scientific Name Thor amboinensis Common Names Sexy Shrimp, Dancing Shrimp, Squat Shrimp Maximum Size 0.5 to 0.75 inches (1.2–1.9 cm) Minimum Tank Size 1 Gallons Diet Omnivore (Scavenger, loves meaty pellets and frozen mysis) Temperament Entirely Peaceful A Note on Reef Safety: While generally considered reef-safe, a starving colony of Sexy Shrimp may nip at the slime coat or polyps of certain corals—particularly zoanthids or large-polyp stony (LPS) corals. Keeping them well-fed with standard aquarium foods easily prevents this behavior. Because of their tiny size, they should never be housed with predatory fish like hawkfish, wrasses, or dottybacks, which will quickly view them as an expensive snack.