No, I can't plumb it to my 125gal, the tank were so far one of each other. My new tang will divide my lounge and my dining room and will be visible on 3 faces.
For the macroalgea, I presently have cheato and red gracillaria at the store, so I'll go for it.(but personnaly, I think that cheato don't look nice!lol but it is really effective for water filtration)
I love caulerpa, they are really beautiful macro (the feather in particular) but since I've experimented sexual reproduction of it in one of my past tank, I'm not sure I want it again...come back home and find that my water was all green was not a think I want to experiment a second time...
For the zoa, we got a large variety of colors at the store (red, yellow, green, orange), so I'll probably go with all I can have. I'll try to post some pics this evening, when the tank will be install.;-) And for the black sand, here is a pics of the tank of a friend of mine. I think it look really good!