I put crays in before I had any fish that were big enough to eat the crays.
The crays wiped out all of my wonderful APW and sago.
Had I known that was going to happen I would have waited at least a year after the fish were stocked before I put crays in.

I dipped a couple dozen GAMs out of the marsh and put them in the pond. They have done well, and multiplied in their numbers.