I want to make a nice large pond, but don't have enough money to buy the expensive equipment (giant pumps, etc.). Is there a way to have an established pond with fish and plants without a pump? I was thinking of using that type of pond liner that fits the hole that was dug (like a plastic tarp, if it exists). I was hoping to stock it with some aquarium fish (guppies, mollies, africans; maybe angels instead........) and harvest the offspring. help... I know nothing on how a pond works!