hey guys well after a long debate and lots of time drawing i finally decided its time to build tank. it's going to be in my basement its 5'x3'x2' and it going to be approx. 250 gallons. i wanted to add a viewing window but not on this one.i plan on putting panel board on the outside and 1/2 ply on the inside and building a support structure for the floor. i just started 2 days ago on my free time before and after work. i want to buy a pond liner and line the inside of the box.