Schematic for 120 gallon aquarium

For a 4 foot wide tank, you only need a 2x4 top frame, not 2x6. My LFS has multiple 4 ft x 4ft tanks that just have a 2x4 top frame with 4 x 4 posts at the corners that go down to the concrete with 3/4 plywood on top. They have had these tanks up for 10+ years, no issues, no bowing / sagging.
 
You can always go watch king of DIY on YouTube. That’s how I started my build.
 

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WHICH TYPE OF MISTAKE TAUGHT YOU YOUR MOST EXPENSIVE REEFKEEPING LESSON?

  • Moving too quickly or adding too much at once

    Votes: 10 33.3%
  • Skipping—or shortening—quarantine or dipping

    Votes: 5 16.7%
  • Buying the wrong equipment the first time

    Votes: 5 16.7%
  • Ignoring maintenance, warning signs, or redundancy

    Votes: 9 30.0%
  • Chasing numbers or making too many changes

    Votes: 3 10.0%
  • Choosing incompatible fish, corals, or invertebrates

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  • Poor aquascaping or tank-design decisions

    Votes: 2 6.7%
  • Failing to research an animal’s needs

    Votes: 1 3.3%
  • Trusting bad advice

    Votes: 4 13.3%
  • Doing something on the tank when you should've gone to bed

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