I am finally moved into my new home and with spring in the air I am looking to build a small goldfish pond. Many years ago in my other home I had a large goldfish pond but got tired of battling raccoons herron etc.. so I just gave it up. I am detremined to make a area of my property that i can go to and relax and watch the goldfish. So, I have a old woodshop that i'm turning into a hobby room and off to the side of it there is about 10-15 tree's. I cleared out all the brush, and leaves etc where it had not been kepth up before. I have about a 10 ft x 8 ft open area in this area of trees and I want to make my pond paradise here. I want to have about a 100 gallon top pond that flows down into a 30 gallon bottom pond and return water flow back to the top pond. What i'm trying to do is build a figure out a design for a bio filtration filter. I plan to surround the pond with pea gravel and slate for a walkway around the area with a bench to relax by the pond. So let me have it. I figure im going to push it by putting the pond around a cluster of trees and then theres the whole bio filtration thing that i got to figure out. I currently have a 1 year old 200 gph pump, a 100+ gallon preformed pond liner and a 30 gallon bottom pond. I thought about using the 30 gal bottom pond as sort of a bog filter. Input?? Any ideas or suggestions to do this right are certainly welcomed. Thanks for having me in the forum.