120 gallons is the smallest tank you can make out of 1 sheet of plywood. Anything less than that is probably not worth it. I built a 120, a 240 (8x2x2) and a 360 (6x4x2). They are not as aesthetically pleasing as a glass tank, but they work just fine. I braced the front and back with edgewise 2x4s near the top, which made filter connections a bit of a trial. Sorry, this was about 1983 and we didn't have cameras then.
One thing I remember, the guide I was following (from the Chicago Shedd Aquarium I think) recommended that you paint the inside (of course) but not the outside. In their experience, aquariums painted inside and out tended to rot when small amounts of water became trapped between the paint layers.
2 inch #10 pan head screws every 2 inches along the seams, with the hole in the flat piece drilled extra big so the threads would not catch. Make sure to drill a pilot the same size as the screw body 2 inches deep or you will split the end piece. Paint the interior with a paint that is safe for contact with human water systems, then seal the seams with silicone.
Easy as pie.
For the really big ones, I built the stand first and constructed them on top of the stand. Otherwise setting them in place required throwing a party.
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