I'm new to this forum but I have had my pond for over 4 years. I currently have a 15,000 gallon pond 32 feet by 15 by 7 feet deep. I have (2) 4 inch drains that basically run thru a pump and then to the water fall. I'm on a low budget but on the other hand do not want to continue to throw money at it. Any suggestions would great. Setting tank (How Big) Bio Filter ?? For some reason I could not upload my pictures.