I was going to use a 75 glasscage tank for a filter...but then I cracked a bottom corner before I even got started. Good thing tho because the way the stand got built it wouldn't fit. Only 14" between some 4x4 supports that get in the way. A 55gal would fit but at that point I was just going to build it myself.
This is some early pics of it for this thread. I have more in my build linked in my sig. There is the exact same setup on the left and right side of the stand with the sumps connected. Water from the tank hits a smaller trash can where there will be filter socks. That is sitting on a stepping stool in the sump to get the right height. Then that dumps into the trashcan with the scrubbies. Then pumped back to the tank. The controller does it all...lights temp pumps and has a ton of features....that last graph is 5 days of the temp with the lights coming on and off (800w MH)...probe out of the water...and addition of a heater.