Dendronepthea sp.

[Ralistin]

Sorry, I can't think of the word for it but are these corals considered one of those that release toxins in the water in order to compete for space?

[EricHugo]

They are, although reports have been variable. While producing them, they also may depend event more on their sharp sclerites for defense and reproduce asexually by branchlet dropping -these both play a role in the production and use in various secondary metabolites and resultant allelopathy in closed systems - of course, they actually have to live for awhile in a tank first!