I think that's why it's so important to try and establish what's in the pond now, as well as pinning down how the undesirables arrived.

IF they were bucket stocked, what's to say that the next occurrence might not contain GSF, or BH, or WC? Perhaps they're already present?

"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.