I am building a pond for my mom, it will be 7ft across 11ft long and about 2 feet deep. it will have a water fall that is 1.5 feet above the water. I am trying to pick out a pump and filter, i have selected the laguna preasure-flo 1400 filter, and deciding on the pump, either laguna max flo 1500 or 2000, there is only a 20 dollar difference between the two. my only worry is that the 2000 will be too much for a pond this size. any suggestions.