as far as i know,
crown of thorns feed voraciosly on corals...
dun think they can survive on liquid food for long.
never heard anyone sell or keep it.
fire corals....i saw at some LFS,
the owner told me its a fire coral,
reddish orange but i doubt it cos i saw him handling it.
blue ring...
uh, i think someone here keeps it.
might be difficult to find in local LFS though...
also, its a great escape artist, and feeds on inverts and fish
your filtration has to be good too cos if it inks in a small
poorly filtered tank, it'll kill everything incluing itself.
BUT!!!! most important
unlike the lionfish, lyretail blenny,rabbitfish....
which cause pain.....
this one kills
but if you do manage to find one,
i'd like to view it