The Alligator Pipefish, Syngnathoides biaculeatus, exhibits a straight pencil-like body and is related to the Seahorse. Its slender green body features an elongated snout resembling a pipe giving it its name. They do not possess teeth and have specialized armor-like scales. The Alligator Pipefish uses its dorsal fin to swim around the tank although it is a weak swimmer that will spend much of its time floating.
The Alligator Pipefish is peaceful, will eat a carnivorous diet, and can be housed with other members of its own species. They require a large tank with plenty of live rock, plants, and structures to grab onto. Seahorses and Pipefish can actually form a symbiotic relationship together as the Seahorse will grab onto the Pipefish. They are reef safe so long as they are not housed with aggressive corals, sea anemones, or aggressive inverts.