Go to <a href="http://www.seahorse.org" target="_blank">http://www.seahorse.org</a> They can tell You more. I have 3 in a 20 gal. and they are doing very good. You can't keep other fish in the same tank or the ponies will starve to death. Ponies are slow eaters and the fish will eat everything before the ponies even suspect that there is food around.
I think the best place would be to get these would be <a href="http://www.oceanrider.com" target="_blank">http://www.oceanrider.com</a> They have ponies that eat frozen food. Not cheap, but then they have a better chance of surviving. Also because you need to feed often, you will need a lot of snails that will clean up after them. Otherwise you will have way to much phosphates, and ammonia build up. Check out the places I put on here, and you can't make a mistake.
HTH LOL