clk666, hello. Welcome.
I'm sure lots of more experienced people will weigh in here, but first I'd say, slow down. First, your live rock will have to be "cured". Is it pre-cured? If not you have to cure it. If it's pre-cured, you'll still have to wait a bit before you're ready for fish. At the bottom of
this page, there's a Reference Library. Start clicking and reading.
People need to know more about you in order to answer your question. How big is your tank? Do you have a sump? How big is the sump? Have you ever kept fish before? Freshwater? So post, some more info, and it will be easier to help you.
And last, if it's a first saltwater tank, I'd forget about the seahorses. They require very good and very stable conditions, and usually need to be by themselves...............
I hope this helps,
