That is a very interesting question. After reading it over I got a bit confused as well. I do have some cover along the sides and some artificial stuff for the fatheads as well as a shallow patch that the grass and plants are starting to grow back in, but not sure of how much I need. ( By the way I think I am going to try the Y Perch and SMB combo like you mentioned ) But in doing that I know I have to stock a great deal more crayfish in the pond to provide for the SMB.
