Coral Attack!

I looked through my recently cleaned acrylic walls today and found this activity going on.

The Echinophyllia sp. or "chalice coral" on the right is attacking one of my prized Aussie acans on the left. They've both been glued down in place for several months, so I'm not about to go in there and separate them.

Here's a close up of the threads being sent out from the chalice coral. Why is it that my pretty ones have to get zapped?! I guess in the coral world, they must be saying to each other: "Don't hate me because I'm beautiful"!