My zoas seem to react pretty well to the rotifer spot feeding I do, occasionally Ill mix the rotifer with some zoo and phyto(reef chilli) before feeding and they seem to like that as well. Other than 1 colony which only opens for a cpl hours a day all the other frags open all day and look happy, no growth but I have only had most of them for 2 weeks so I hope to see some over the next 6 months.
I do run my skimmer 24/7 and turn the powerhead down when spot feeding, the acans seems to like the roti as well but they will also eat whole mysis like the candy canes and rics. The paly's try to eat whole mysis but it seems they cant get the whole thing that they caught into their mouths =P