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From The Aquarium Wiki

Syngnathidae, or Pipefish and Seahorses, is a family of fish which includes the seahorses, the pipefish, and the weedy and leafy sea dragons. Fish of this family have the unique characteristic whereby females lay their eggs in a brood pouch on the male's chest, and the male then fertilizes and incubates the eggs. The name is derived from Greek, meaning "fused jaw" - syn meaning fused or together, and gnathus meaning jaws. This fused jaw trait is something the entire family has in common. Belonging the order of Syngnathiformes with 278 known species.

	Common name	Difficulty	Maximum Size	Minimum Tank Size
Hippocampus fuscus	Sea Pony	Challenging	66 in15.24 cm	3030 gal113.562 liters 113,562.353 mL
Hippocampus reidi	Brazilian Seahorse Great Brazilian Seahorse Longsnout Seahorse Slender Seahorse	Challenging	88 in20.32 cm	3030 gal113.562 liters 113,562.353 mL
Syngnathus acus	Greater Pipefish	Challenging	19.68503937007919.685 in50 cm	6565 gal246.052 liters 246,051.766 mL