If circumstances permit, I would try hand feeding first. Auto feeders are nice when conditions warrant, but they cannot provide the feedback that hand feeding and walking the bank will provide. Especially for a new pond owner. Your pond will have lots to show you, if you are out there observing firsthand.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.