thanks for clearing that up.
well, seahorses are fragile organisms, that are extremely care dependent. i strongly advise not housing horses until you are well knowledgable on the subject. im sure after 30 minutes of reading seahorse care you'll decide it is too much to keep up with.
corals and anemones need a tank that has alk, calcium, magnesium levels stable for survival. anemones should be housed in a more "established" tank to ensure its stability. if an anemone dies it will "nuke" your livestock.
ill start with a few questions, what kind of lighting and how is it adjustable? what kind of anemone were you thinking, and what kind of fish (if any) do you plan on housing?
my intention is not to discourage you from keeping a saltwater tank but to inform you prior. please do countless hours of research to ensure your success as well as learning the right way of doing things the first time around. if you have any questions dont hesitate to ask.