sump/fuge for non drilled tank help ???

I have a 20 gal long tank with a hang on the back skimmer and filter and I want to add a sump/fuge and I have no idea how to make it happen without drilling. Is there any way that I can do this without drilling my tank? I have a spare ten gallon tank that I was thinking about using to make and be able to hang the skimmer and filter on that and add a phosphate reactor. I was just wondering if there was any way to do it without drilling

 

You can do it with an overflow box. Search around, there are several different kinds out there. Easy to set up and very reliable, as long as you do monthly maintenance.