High-crown Seahorse Hippocampus procerus.
Seahorses live in weedy habitats in the shallows, and among sponges when in deep water. They rely on a prehensile tail and mastery of camouflage, including the ability to change colour, to avoid predators. The High-crown Seahorse is found from Moreton Bay to Fraser Island in Queensland.
Source: Post Australia, Westpoint Shop, Blacktown