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Seahorses are like chameleons that can change too any color usually to camouflage so if they are living in a clump of macro algae they would change to green.
Seahorse Source is a great site to order from as well. I can't vouch personally but I've heard good things and their dwarf seahorses are much cheaper than Ocean Rider's. I know seahorse.org has an amazing amount of information if you are looking to research a lot.