Wanabe
How long you had him for? The thing with these corals, and with other similar corals (carnation corals, many non-photsynthetic gorgs, etc.) is that they look OK, but in reality they are slowly starvng to death.
I am no expert on these, but in my limited knowledge, the problem is three fold:
(i) they can only accept food of a certain particle size. Some people say rotifiers work well, as do Golden Pearls, but I think the particle size depends on the exact species;
(ii) they can only accept the right size particles IF the particles are moving at the right speed. Yes, the flow needs to be correct to encourage the coral to accept the particle, somewhere bewteen 8-14 cms per second (rough guess), in a rnaqdom flow patern;
(iii) they need to eat all the time. Basically in the wld they are constantly filtering for the right food that is coming by at the right speed. This is very hard to replicate in a home set-up as you would need to constantly feed, and this would at some point have a bad effect on your water parameters.
I agree, they are best left in the ocean, or else you almost need to tailor your tank for this kind of coral to work.
Ironically though, the best results seem to occur in simple 'dirty" set-ups (no fuge, not too much filtering, etc.) which are often found in more beginner set-ups...the reason being that there is far more biological matter floating around in the water column than in an expert type SPS set-up.
I would never call this coral "easy" to keep...it may seem "easy" to keep until it starves, and one day no longer opens and falls apart.
The test in coral success should be in having the coral display significant growth and survive for a decent period of time (year minimum).
That said, good luck with it.
HTH
Stewart