Fox Corals are fairly hardy from my experience. The reason that I say that is because the last one that I got (Candy Canes and Fox corals are two of my favorites for some odd reason); I put in a tank with REALLY high nitrates that was two weeks old. Someone just gave it to me when their tank “crashed” and I only had the one tank that it went in that had room.
The things do like little if no flow. So it should be moved to an area with very little flow. I have mine under a thousand watts of metal halides however. One thing that I noticed is that I think they are just HUNGRY. There aren’t many corals with feeding responses as heavy as Cynarinas, but I would say this is one that is up there. But the one that I mentioned above just started receding bit by bit from the base, leaving small holes in the skeleton, until I began spot feeding it.
The good thing about Fox Corals though is their make-up. They can pretty much recede down to a ¼ inch left in the entire skeleton, and sometimes still regrow if they are given the proper care.