LC Petroglyphs growing but polyp size shrinking

[tbaity1401]

Just curious as to the reason why the polyp size on the petroglyphs seems to be shrinking although they're multiplying. Photos taken were 4 month difference.

Too much light? 75 gallon tank under 6 bulb t5. Frag was about halfway down in the tank.

 

[John3]

Hhmmm I have the exact opposite. None of my zoas stay small. Some are huge compared to the original size. I run a Radion G4 with the AB+ schedule @ 70%. So that is pretty strong lighting and I have s bunch at the top of the tank. I also run higher nutrients, maybe that is it.