Mine are doing well at moderate flow and light. I target feed them 3 to 4 times a week too. When I first got a 3 polyp frag it melted down to almost nothing, but somehow came back strong. If you have trouble definetly dont give up on them!
I have mine at around 210 par on the sand bed. I had them at around 600 par 3-4 weeks ago and moved them out after redoing my coral scape. Medium to high light from my experience. They get bright pink in the middle with a bright green skirt under high light.
I had them in medium light /mediume flow and they were super happy...until my 80 polyp colony melted...I tried everythign to save them but to no avail .