I am doing a small upgrade from a 40 breeder to a 75 gallon tank and I plan on reusing my overflow (fiji 800 gph external) and return (3/4" line with SICCE Syncra Silent 3.0 718 gph pump). If I keep my original placement of my return (3" from top and side) and overflow (directly in the corner) then I have to adjust my re-cut plumbing to cover the additional length. What would happen if I move my overflow over 6" and my return over 6" to minimize plumbing rework? Is there an optimum placement on the overflow/return and should I keep them in the corners and bite the bullet on re-cutting and gluing parts of my plumbing?