Scientific name - Percnon gibbesi. Family – Grapsidae Common name – Sally Light Foot, Spray, Urchin, Short Crab Max Size – 3 in (9 cm) Range: Atlantic Ocean, Caribbean, Indo-Pacific Care Level – Easy Temperament – Semi-aggressive Foods and feeding – This crab will scavenge food from the aquarium and will also accept offerings of small meaty foods Supplements: Calcium, Magnesium, Iodine, Trace Elements Aquarium suitability - Reef compatibility – With caution Captive care – This is an opportunistic predator and will go after fish. It also does better in large aquariums with a strong current. Crabs are extremely sensitive to nitrates and copper and small amounts will kill them