32% protein for GFC versus 40% for Aquamax 500/600 and 45% for Aquamax Largemouth. What is appropriate to use depends upon what you are feeding and how manic a pondmeister you are. How I see it:
CC? GFC is more than sufficient.
BG for forage? GFC.
YP/Trophy BG/Smaller HSB? 500/600.
LMB (bigger HSB)? Largemouth.