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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WHAT GIVES YOU THE GREATEST SATISFACTION THAT YOUR REEF IS DOING WELL?

  • Seeing noticeable coral growth

    Votes: 3 20.0%
  • Watching corals open up and show their best color

    Votes: 4 26.7%
  • Seeing fish active, eating, and behaving naturally

    Votes: 1 6.7%
  • Spotting pods, sponges, and other tiny life

    Votes: 0 0.0%
  • Seeing fish clutches or invertebrate babies

    Votes: 1 6.7%
  • Having a long stretch without a major problem

    Votes: 2 13.3%
  • Looking at the whole tank and loving how it’s coming together

    Votes: 2 13.3%
  • Something else (post in the comments)

    Votes: 2 13.3%
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