you should post some pics up on *****, I'm sure we could give you a good ID. And just for everyones info, the octo is fine with the seahorse, actually, quite a few people have been very successful keeping octos with horses and I have never heard of a seahorse eaten by an octo. My favorite octo tank actually has 2 (i believe) blue ribbon eels, a snowflake eel, several horses, and, of course, an octo.
Out of respect for SWF.com please do not advertise for another board!