Hi Everyone. I've been thinking about putting a small pond on my backyard. I can't remember what the frost line is for NYC (3ft, 3.5ft?). I would like to put it in the corner, PVC fence on 2 sides, and a lightly "wavy" side (shaped like a corner shelf, if that makes sense). I would have a solid island in the middle, possibly with depression in middle of island for soil/plants(reverse donut-esque shape) and cover with liner. I would have a filter as well. I would like to stock with white cloud mountain minnows or various types. 1. Is this a good setup? 2. What is the frost/freeze line for NYC? 3. Would I need to run the filter all winter? The pond is full sun. 4. Can I add tadpoles? If so, what type? Thanks!!!