some noob aquascaping questions

Your setup is looking cool. Nicely done.

 

Thanks guys, I had loads of fun with it so far
@cheekychops :Yes I'm hoping my floating island looks better once covered with your moss
@Wyvren: I like your wood bridge idea. I was also toying with the idea of a underwater waterfall at the back of my "riverbed" but the background color and finishing of the sump will happen first. For now the red rocks will stay until I find nice black ones, or until they are covered in moss.
Now I need some julii or bandit/panda cory at the bottom, and 2 or 3 koi angels. Anyone selling some of these?