I am so thank-ful I have found this site.I am new to ponding and right now I am halfway with the construction.I am building a main 4 foot waterfall w/2 other les dramatic falls on either side.The main pond will be approx. 15x 15 feet 4 feet deep.There is a lot of info to digest eg.fish,plants,water ph and so much more.This sounds like great fun.