One of my first corals I bought 3 years ago. What was once a small piece in the sand bed, has migrated up my live rock and is taking over. Mine are metallic green with long tenticles (very cool looking), but I would rather have the space for more colorful zoas. hey are at the bottom of my live rock, so I would have to remove the entire baserock in order to chip off a section of the rock. I have in the past cut off a few polyps, but they emit large qtys of toxic slime. Can these be killed off with chemicals like with aptasia?