Candy cane: Sends sweepers out and will sting nearby neighbors. These can get longer than you think.
Kenya: Satan's spawn. Will kill an SPS
/Green/small Button Polyps: need plenty of room for growth. Will happily take over another coral given the time and calcium.
Green Cup Plate: Probably pretty docile though if it is a leather it comes with its own bucket of toxin
Yellow toadstool: Toxins
Bubble Coral: Throws stingers in addition to the bubbles
Closed brain: These things can surprise you by actually putting out stingers. I was shocked to see that these stingers can be up to 2-3" in length.
Join the NJ Reef Club
Today! Saving the world's reefs one living room at a time!
Atlantic City, NJ September 25-27, 2009