This is growing between the pieces of rockwork! I wish I had more space on the glass for more leptos. I was just checking out this tile in my frag tank which has managed to encrust all the way around.
While this piece is on my rockwork it would also do well encrusting to the glass. Stylocoeniella : Seems to be packing a decent sting as it's damaging the chalice above it. You can also see I have other chalices, cyphastreas ect in the shadows.
If you want some height in lower light places, branching cyphastrea is a good choice but in my experience it grows very slow.