It was suggested to me to add a few GC with the first fish stocking. I wanted some vegetables (grass and such) in the pond, heck, I even spent quite bit of money to get the right ones growing. And so I did not add any GC. Now all most two yrs later and I still have no veggies in the pond. The crawfish I added to the pond took out the vegies. if I would have added the GC back then, they would have starved or the Wr would be pretty poor i'm thinking.
Tracy