I can answer your questions, but don't have it in me to do all of them at once (sorry, I've been doing yard work all day). I'll address "heating in the winter" first. I lived in colorado for a number of years, and on my property sat a 8000 gallon koi pond. I needed a depth of 6' to properly overwinter the Koi I had, though this depth was not needed but for part of the pond. IN Canada, where the winter's are harder and longer, you may need more depth. The important thing was to keep the top from totally freezing; i accomplished this by using a livestock heater i found at the feed store.
more later, my fingers are tired (pathetic: yes)
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