I would wait 4 months or so to make sure that you don't have any pesky critters that can harm your seahorses.
A seahorse tank is NOT the same as a regular reef environment, take the go slow rule and multiply- go s...l...o...w!
read ALOT before you get them to make sure that you get the BEST chance of keeping them alive as possible.
Seahorsesource.org is a wonderful place to go - and Dan is very very very helpful- I got 4 reidi from him and they came down with gas bubble disease and he helped me out tremendously!
Dracomarine.com or org is another place, they are in MD and also very reputable.
A local breeder if you can find one - or a breeder on seahorse.org
read read read and read some more. They are wonderful creatures and so beautiful, but like most saltwater organisms they require specific conditions.
I hope that helps you.
Here is my build thread on my 29 gallon seahorse tank... I hope it helps you - as I have already made many of the common first timer mistakes
http://thereeftank.com/forums/showthread.php?t=90397