I always feel bad for the seahorses I see in local fish stores. Most of the time they're in the most possible unnatural environment for them... aka, too many fish in the tank, no hiding spots, no plant life, etc. Only once in a store I frequent I saw a great collection of them in an environment filled with plants, some inverts, anemones, and no fish! They often use seaweed or plants to anchor themselves in current environments.