If you feed them meaty stuff they grow ALOT FASTER!!!
but you don't have to target feed, and they will do just fine. mid flow is good, but I had some acan colonies around sps also. (Strong Flow) They get puffy even more. As for lights, they can adapt to high light, but usually low to medium heights are best under LEDs.
On rock is better than on sand as they do grow new heads at the bottom, but if the heads are always cover in sand, those will die off.