They're defnitely not the easiest to take care of. I've seen two azooxanthellae specific tanks (one on the net and one in person) and they were quite successful, however, I don't think a carnation will fair well in a mixed tank. I'd give a +1 to the Nepthea.
Then again, people said the same thing about many of the species that are now commonplace in our tanks. Hell, aquarium bred mandarins that eat frozen/pellet food are now available and little tricks like rock piles (for amphipods/copepods) have let them do well in tanks as small as 10 gallons, which was once thought impossible.
If you're a dedicated aquarist and are prepared for potentially a couple failures I would fully encourage you to to try your hand at them. Do your homework forst though; see what others have done, what works, what doesn't and get as good an idea what they need as possible. Only with people taking educated chances will we ever learn how to care for these creatures. Just my two bits.
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