They are Hippocampus reidi. I don't have them anymore though, when I moved a few weeks ago, my uncle offered to take them in, since I couldn't bring them with me. It was sad to give them up, especially Jack and Diane, I've had them for over 2 years. But I'll be able to see them still, since my uncle has them.
But, They were being kept in a 45 gal aquarium. With 45lbs of live rock, and live sand. Lots of hitching posts, i.e. fake plants and coral, I tried some live plants at one point, but it kept dying before I even transplanted it into the main tank, so I gave up on live plants. I could go into more detail, but I am not sure what all you want to know.
How long has your tank been cycling? And what cycling method are you using?
I was "lucky" enough that my local pet store was willing to order sea horses when I would ask them. But the sea horses they would get, I'm pretty sure, were WC. Which I didn't agree with... And every time, the sea horses were sick or starving. When I first got Diane, she had snout rot. Jack, I never had any health problems with. My other female, Gaile, came to me with ectoparasites... And Seabiscuit was severely underweight. Several hundred dollars spent on meds, and weeks/months in a hospital tank, and they all were eventually healthy and could be kept together. It was just very time and money consuming.
So, if you do find a local CB seller, be sure and know all the signs of any illness so perhaps you can start out with some healthy seahorses. Unlike I did, lol. I knew the horsies were sick when I bought them, but I was prepared to deal with it... even though i shouldn't have.