Who knows what works, best just use what ever works for you.
I have tried so many and they all seem to have a effect, Only way to tell is to put pics up before pics and after pics.
i doubt you have to feed acros, i have seen no real improvements in acros since feeding, so i only feed whenever.
I note that i do get improvements in Goniopra,gorgonias etc.
What are the ingredients of the vitiliser??