Looking at my current rockscape, I've been thinking that my surface area for corals is really lacking which would severely limit corals to the top and the bottom right slope. To rectify this I was thinking about adding a rock on this corner leaning onto the corner of the glass (yellow circle)? Is this a good idea? I just don't see what type of corals could be placed towards the left of the scape due to it having a vertical column towards the front (red circle).