GP, I like the out of the box thinking of pond frog, and he is certainly more knowledgeable than I. I would not have known to suggest what he did, however it seems to make sense. I'd give one pond a try like he suggested. It will be almost free due to the fact that you can probably find the plants and gambusa in the same local BOW. Use the money saved from that pond to do something totally different in the others. Whatever you decide to do...i'd recomend you keep extensive notes. Notate what day you did something, how much of what you used, what the effect was, etc. Sooner or later you are bound to figure out something that works. Your notes will help you retrace the steps and reproduce it. As well as be able to tell us what you did that screwed it up and made it worse!
