I was thinking about building a sump for my 300 gal. I don't want to drill any holes do to the stock of fish already in it. My obstacle is it's a one piece unit. The stand is 2" angle iron, welded all around glass as well. The top lip of the angle protrudes inward all the way around the top. It was a little difficult to get my fx5 to fit so how should I go about trying the overflow? Please speak like I'm 10 yrs old, I've never dealt with an overflow/sump set up. THKS.


