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.
 

WHICH PART OF YOUR SETUP IS HARDEST TO REACH OR REMOVE FOR ROUTINE MAINTENANCE?

  • Glass behind or beside the tank

    Votes: 8 26.7%
  • Powerheads or wavemakers

    Votes: 3 10.0%
  • Sump or rear filtration chambers

    Votes: 5 16.7%
  • Skimmer or other filtration equipment

    Votes: 1 3.3%
  • Overflow or plumbing

    Votes: 7 23.3%
  • Lights or lids

    Votes: 0 0.0%
  • Mine is pretty easy to access!

    Votes: 5 16.7%
  • Other—tell us what I missed

    Votes: 1 3.3%
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