mine are sitting under 4 T5 bulbs, on the top of my rock (about 8 or 9 inches from surface). No I do not feed them as I am pretty sure they are entirely photosynthetic. I may be wrong about that though as I have seen food stick to them and then disappear though I have never really watched the full process. They have a very light flow pushing over them, enough to keep their tentacles moving ever so slightly.
Wat stays at 80 degrees, SG at 1.026, Lights stay on for 10 hours a day, I add supplements on a three day schedule, and change 17% of the water every week.
Maybe that will help so you can compare things, I am not really sure what makes them bud.