Ive got about a 200 gallon preformed pond that I put in a couple years ago. However it hasn't gone great as a very still lilly pond kind of thing as it just get so muddy and cloudy and is alot of work so this year im trying something new. I want to do a pond that kind oflooks like a pool or eddy in a fast river where its not overly flowing but you cantell there is some water movement. However I dont know what size pump I should use to get this effect. The pond is about 3 feet deep and i guess what im trying to ask is how many gph or head am i going to need for a distubance at the top?