Really? Do you have any specific species of macro algae I could research?
I do like the idea of a seahorse tank, as far as looks are concerned, but I don't know about pipefish. They just look weird to me.
I don't foresee any stocking that includes tangs (I'd like to keep them in a tank large enough for them to have a lot of room to roam), but I may consider a dwarf angel, since, when I set up a reef, it'll be 55 or 75 gallons. Mostly, I want a pair of clowns, a yellow coris wrasse (or two) some neon blue gobies, some mollies, and some banggai cardinals.
A planted, sort of, marine tank. Might be interesting.