Hi, All! I am anxious to break ground for new wildlife/recreation pond. However, I am a little confused as to what equipment is appropriate for my plan. It will be 9ft x 11ft, largest area about 1ft deep, with shelves progressively deeper to 3ft. Lots of plants, no fish hoping to attract many frogs! I know my kids and dog will be in it, so I want to use an external centrifugal pump. I also want a small waterfall, no more than 3ft higher than pond water level. I don’t love the idea of skimmers/filters because of threat they pose to the frogs, but it seems I will need something to protect the pump. All suggestions are welcome! Thanks in advance!