I've had decadia's in the past and they seemed to like med flow and med light. The microphthalma (Larry's Mine Field Ceph or something like that-nice blue and green) didn't do well for me. I had it low in the tnak and in med flow. Cephastrea are a cool coral.
I know that mine like light so medium-high light placement. I would give a good amount of flow to help growth stimulation. I feed cyclo-peez once or twice a week. Fragging is easy with these guys but I would wait for it to get established and encrust to whatever you have it attached to. Make sure you keep it out of the sand...it irritates the polyps. They are pretty easy to take care of and come in a couple cool color morphs.
*This is just my experience with my cyphastrea's, so get more info before you buy.
Thanks alot, Jen. Now I've gotta find some more Cephastreas. At least my wife got to see these so I will only get a lug wrench swung at my head rather than rabbid attack ferrets sent to get me.
Not too much light on these guys. My Atlantis original went brown until I reduced the intensity and went 14k. Now it's electric green with the orange/red polyps and about the size of my hand. Pretty aggressive too.
Dave