LOL.....barebottom, lol.
Still considering adding substrate though. The white aragonite cos this will brighten tank up a lot, BUT, want to increase flow so afraid of creating sandstorms. So will still see wrt this, for now, I'm liking the bare bottom look too.
If u look at earlier pics you will see the LED unit was lower down, picked it up now because at the initial height it was not giving good coverage, will see now if light penetration is ok at current height, so far corals seem ok, keeping Lps lower down and sps up on the rockwork.