Clean the Waterfall Again

It was time to clean the waterfall reservoir again. In fact, I never cleaned the waterfall reservoir last year. So in two years the Sweetflag grew so thick that it filled all the space in the reservoir and on occasion was causing some of the water to spill over the sides. Left unchecked, the spill could drain the pond. That didn't happen in this case and now the waterfall is good for at least another year. When cleaning it I only disturbed two medium sized frogs. When I cleaned it last time I seem to remember at least 4 frogs living in the waterfall. The after photo looks almost bare.