My 1" cyp fry can eat the 1 mm size, and my multifaciatus colony multiplies on the 1 mm pellets. If I have new fry in my cyp grow-out tank (babies having babies), I'll crush some 1mm pellets before throwing them in.
I do use the Grow formula for baby gobies, cyps, and julies when they're young, but I don't feel it's particularly necessary.