my seahorse is kept in a small 16gal tank all to himself, he is my show off piece. i wouldn't dare put him in my reef tank, other inhabitants would be too much competition for food. seahorses can be difficult to feed, and many starve to death in captivity. brine shrimp are not very healthy, however i keep brine shrimp in a green water culture. this way the brine eats the nutrients in the green water and are more nutrious for my seahorse. i also hand feed my seahorse live ghost shrimp. my seahorse eats very well, and has been doing great for as long as i have had him. if you are interested in seahorses, i would suggest aksing the LFS
to feed the seahorses before you decide to buy one. however moving a seahorse is very stressful, and they might eat at the fish shop, and then once you get them home they may never decide to eat again. so you just have to give it a shot and hope for the best.