Barryi,
I just got 2 mustange seahorses from OceanRider.com.. can I say that? They are farm raised and AWESOME... Just make sure your tank is cycled COMPLETELY... My tank had a mini cycle and I thought it was DONE.. BIG MISTAKE, I had an amm spike and I am having a hard time controlling it (water changes, etc) so they done DIE..
Oh, I have them in a 15H..... If you have the stand for the 10 gallon, i would say get a 20H, it will fit on the same stand and will give them more room and wont cost you a fortune....
Good luck, Kim