I've been gravitating towards less and less rock and more open space - more negative space, less dead areas for circulation, and more room for fish to swim around. It also limits me on the corals that I truly want to grow out versus collectoritis syndrome.
The black is actually the silicone. Each corner has a triangle (possibly polycarbonate) for support from what I can tell and then the black silicone.
The recurve seems to be a decent fixture from what I can tell. Everything feels sturdy and well built. It's putting out a ton of light, but I don't have the controller on hand currently and haven't messed around with the onboard. It's was on at 100% on all channels in the picture. I need to connect with Vincent to borrow his PMK kit to pull some measurements (currently setting all channels at 50% in the meantime).