Hello Everyone this is my first post, I'm from Ontario Canada and I presently have a 1/2 acre pond with Walleye perch and blue gill. I just recently dug another 1/2 acre pond 30 feet from my existing pond. My game plan is to drain the existing pond next spring move all fish to the new pond and dig the existing pond deeper In hopes that 1) I can remove the Millfoil or 2) any milfoil missed would not survive the summer if I kept the pond empty. I don't want to remove all the rocks that I put around the pond they go down the sides approximately 10 feet My question is do you think that if I keep the pond empty that it will kill the milfoil that is growing out of the rocks or will it come back the next year?