If money is not a real issue, you have nothing to lose by adding the walleye at 7"

Starting a culling program for the NP is a good idea, but you may want to back it up with some catch data establishing the 'condition' of the NP, like Omaha suggests.

With the NP population, I would personally not be as concerned about the overpopulating potential of Black Crappie.

If you are looking to reduce some of that weed growth, pond dye might be an option.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."