After I posted, I realized that maybe I do not want to enhance the BG spawning habitat. If I try to suppress spawning, then I may actually enhance the size distribution of the BG population. (The little buggers will probably spawn plenty, despite my efforts to help or hinder.)

I think I need to go read more of the BG management threads.

*** Every time I try to figure out a pond question, I quickly generate five more questions for which I need to know the answers. A hearty thank you to everyone who has ever posted an answer to the PB forum. You have created a treasure of knowledge.