The sexy shrimp is a tiny, charming reef invertebrate named for its constant swaying, abdomen-flicking 'dance.' Brown to amber with white saddle markings, it lives commensally among anemones and corals and is best kept in a small group in a nano reef.
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Circumtropical — Indo-Pacific and Caribbean/Western Atlantic reefs
Origin
Worldwide
Climate
🌴 Tropical
Water type
🌊 Marine
Family
Thoridae
Genus
Thor
Part of the Marine Shrimp
A varied group of saltwater shrimp kept for their behavior, color, and usefulness — from burrowing pistol shrimp and their goby partners to ornamental and scavenging species. Most are reef-safe inverts that appreciate stable, mature systems and copper-free water.
From the minimum an animal needs to be kept humanely, up to the ideal setup. Bigger is almost always better — minimums are floors, not targets.
Photo coming soon
Minimum
Reef nano tank
10 gal (≈ 38 L) reef nano
Thor amboinensis ('sexy shrimp') is the smallest reef shrimp (~1.5 cm). Keep in groups of 5+ in a nano reef with anemones (bubble-tip, condylactis) or large mushroom corals as host perches. Stable 1.025 salinity.
Photo coming soon
Recommended
Established nano reef with anemones
20 gal nano reef, anemone host
A 20 gal nano reef with a bubble-tip anemone or mushroom rock as host, peaceful nano fish, and stable parameters. They wiggle their tails to advertise themselves to clients — hence the name.
Photo coming soon
Ideal
Display nano reef
20–30 gal nano reef, anemones + cover
A planted nano reef with anemones, mushroom corals, and stable parameters. Generous shoal size (8–10) showcases natural commensal behaviour with hosts.
Life & growth stages
How this animal changes through its life — each stage often has its own care, diet and space needs.
Photo coming soon
Larva
Most marine invertebrates hatch into microscopic planktonic larvae (such as the zoea of crustaceans or the bipinnaria/veliger of echinoderms and mollusks) that drift and feed in the water column. The larva looks nothing like the adult and undergoes major reorganization.
Photo coming soon
Juvenile
After settling out of the plankton, the juvenile takes on a recognizable miniature of the adult body plan — a tiny shell, a small star, or a translucent shrimp. Crustaceans grow by molting, shedding the exoskeleton to enlarge.
Adult
Adults reach full size and reproductive maturity with the species' mature shell, shape, or coloration. Many continue to molt or grow throughout life, and some show sex differences in size or claw/appendage shape.
Habitat & enclosure
Keep in an established reef or nano tank of at least 20-40 L (5-10 gal) with live rock and, ideally, a host anemone or soft/LPS coral to perch on. Maintain temperature 24-27°C (75-80°F), pH 8.1-8.4, salinity SG 1.024-1.026, dKH 8-12, and low nitrate with very stable parameters, since small volumes swing fast. Moderate flow and standard reef lighting suit it; it stays near its host in the open.
Because of its small size, it is well suited to peaceful nano reefs rather than tanks with large or boisterous fish.
Substrate
Aquascape with live rock and a host anemone or coral as the focal perch. Fine sand or a shallow reef bed beneath is suitable; the host is more important than the substrate to this species.
Equipment & setup
Use mature biological filtration suited to nano reefs (live rock with a small sump, hang-on filter, or skimmer), and a heater for steady tropical temperatures. Gentle to moderate flow and standard reef lighting are adequate; keep the system copper-free and stable.
Diet
Omnivorous, feeding on detritus, mucus, and food scraps gathered around its host, and it may nip host anemone or coral tissue lightly. In the aquarium offer finely chopped meaty foods — mysis, baby brine, and crushed pellets — as it is a poor competitor and can be outcompeted by faster tankmates.
Behavior & temperament
Peaceful, social, and reef-safe, best kept in groups of three or more, which gives a lovely clustered display on a host. It associates with anemones, mushroom corals, frogspawn, and similar hosts; it may irritate some corals by perching, but rarely causes serious harm. Vulnerable to predation, so avoid wrasses, hawkfish, dottybacks, and other shrimp-eaters.
Health
Hardy for its size but very sensitive to acclimation stress, copper, and parameter swings in small tanks. Molting issues from low iodine or unstable chemistry can occur. Its main risk in a community is simply being eaten or starved out by larger, faster tankmates.
Tips, DIY & hacks
Drip-acclimate slowly, as this tiny shrimp is easily shocked, and keep a small group for the best clustered display. Provide a host anemone or coral and house it with only small, peaceful tankmates to prevent predation. Target-feed near its perch so it is not outcompeted.
