A very high maintenance coral but beautiful.If you don't mine feeding them regularly then go for it.A mixture of cyclopeeze and mysis makes for a happy,fat sun coral.I'm not particually fond of the black sun corals.The yellows and orange are fantastic though.Remember,they don't always open when the lights are on.They can be trained to open somewhat if you feed regularly and at the same time each day.
I highly recommend Dendrophyllia over sun corals(Tubastrea spp.).The polyps are generally much larger and tend to stay open even when the lights are on.They can fetch a hefty price so don't be too shocked.