So I'm planing on having my whole back yard redone and have picked out a spot for a small, simple, 4-5'x6-7' fish pond. It would be 2 ft deep...and based on those dimensions I would be running about 450-500 gallons max. It would be out of direct sunlight most of the day thanks to a UV covering I plan on using directly overtop of the whole patio area I'm digging the pond out at. I'll be using 6"x6" pavers for the patio surface around the pond...although I don't think that's terribly relevant. So given that this whole project is kind of in its infancy I'm trying to get an idea of everything I would need to have a clean pond, what type of lining I would need (preformed plastic vs. a flexable, formable liner?), what type of filtration system you guys would suggest, and, asthetically, how I can use things like pebbles, stacked stones, etc...to hide the liner in the pond -- basically to make it look as natural as possible. And go!