As I have started to design my own sump/refugium i have come up with a brand new design. In my new design I have a 4 stage separate sump. I have not physically created one yet but I have made 2 designs for only a 20 gallon tank. When I am finished creating it I will test for every possible substance in the tank. I will checkpoint the first week the 3rd month and 6th month. I will take a picture of my plans of the 2 designs and upload them