I'm looking to installing a complete filter this spring. I currently have (2) 4 inch drains that basically run thru a pump and out over a waterfall. What is the best route to go. I understand I need a settling tank and then a Bio filter. I have done a lot of reading but no one has a clear cut of doing this. I wiil be adding 4 jets along with aeration to the tops of the drains to help. Any help would be apreciated.