Ever since I built my overflow and sump I noticed my tank is crystal clear...Now I have been running a Fluval XP5 and Fluval 305 with medium since October and this tank has not been this clear..... I have a 20 gallon Sump with some plants and gravel and a sock with carbon in it.... Thumbs up for the DIY stuff.... 
[YT]VSoglsy7rXk[/YT]
[YT]VSoglsy7rXk[/YT]