I had read that about the plunger. I have a 'blue' one, do you think it will work as well as the red?? ;-)

I'll bet it will help, but I wonder about those big folds standing at attention.

I'll give that a try. And thanks for the suggestion about the bleach; I was going to do something as soon as I was finished splashing around in there on my hands and knees. I had one of those 6-way shock packs from Home Depot. Those wacky toads came back yesterday for a love-fest, I had eggs to skim out again today. I heard them out there again tonight, too, lured in by that fresh, untreated water.