I just replace what I remove from the pond every year.
What about morts from natural causes, like stress or getting eaten?
Morts I don't see any. Getting eaten is a hard one as I'm trying to transition away from LMB in the pond to SMB/HSB. As for eating a lot of forage, with BG in the pond I hope so, but since they also are pellet trained, they do well eating floating protein.