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 SUPPOSEDLY EASY CORAL HAS GIVEN YOU THE MOST TROUBLE?

  • Zoanthids or palythoas

    Votes: 19 19.2%
  • Mushrooms or Ricordea

    Votes: 20 20.2%
  • Green star polyps

    Votes: 13 13.1%
  • Xenia

    Votes: 10 10.1%
  • Leather corals

    Votes: 10 10.1%
  • Duncan or candy cane corals

    Votes: 22 22.2%
  • Birdsnest or Montipora digitata

    Votes: 26 26.3%
  • None—mine have lived up to the reputation

    Votes: 5 5.1%
  • Other (tell us which one)

    Votes: 3 3.0%
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