Coral GOT

[Dash]

There's a bit of warfare going on. My bonsai keeps spreading rather than growing vertically. I just noticed it's pushing against some Bam Bams, and there are strands of mucously something where they are touching. Is the spreading growth telling me something about the bonsai's placement? Not enough / too much light? How can I stem its growth in that area to protect the zoas?
Untitled by Magdaline Chu, on Flickr