I really have no idea FUA. I had it under only 72 watts of PC in my unskimmed nano and it did fine. I moved it over to my 210 and that was when it took off. It is under XM 10K 250 Watt Metal Halides now and the tank is well skimmed so I would assume that it really likes light quite a bit. I do feed the tank heavily, however, I have never seen this coral actually eat.
Lisa