I am finally starting my pond this week. I have inherited a pond from a family member. The pond is 6'x13' with a few goldfish and the liner is only about 6-8 yrs old with no issues as of now. I am told the liner is larger than 15'x15', I will know for sure once i get it drained and removed on Thursday/Friday. I have created the pond layout and I plan on making a DIY skimmer. The pond is roughly going to be 13'x6'x 24" and will only have goldfish in it at this time. I know the pond size is not suitable for KOI. So a few things I am thinking about changing with the design....Directly in front of/across from the waterfall i wanted to have a hiding spot for the fish in the square area. Some have suggested to move it so it is not in front of the waterfall because it will collect a lot of debris. Also the bottom right corner is a concern for debris to collect and lack of water flow. I have posted a few pictures please critique my design and give any recommendations/changes. The Red line on the right side of the pond is where I will be running the electrical line for an outlet next to the waterfall which will be hidden. The red line on the left side is where the water return line will be coming off the DIY Skimmer.