The LMB will definately put the hurt on them. You can easly start with YP and SMB if not getting desired results ya can switch to LMB. I know everyone with a new pond wants immediate results but you will be amazed how fast 5 yrs will click by. It's fairly easy to catch and transport good sized LMB and BG to get fast recruitment.
Someone once said stocking a pond is similar to landscaping. The bigger ya start with, the more the expense.
