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Depending on the species of seahorse, they can live in temperate waters or cooler water areas. Pot Bellied seahorses are a cool water species. They DO NOT eat seaweed by the way. and they swim because they are conisdered a fish. They have gills. An octopus is an invertebrate meaning no spine, as is a star fish. However, Octopus' can be predatory and eat many fish and require a species only tank that is sealed to keep them from escaping. They are very good at getting out of tanks, because their bodies mold to any shape. Star fish are inverts as well. They can eat some corals, so some species aren't considered reef safe. Others are detritis eaters, which means they clean up after the other fish have eaten.

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15y ago

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