Making a 40 g sump question

looks like the width distance between the side is 17 3/4" would shaving 1/16" of an inch off of that be sufficient or should I do 1/8" of an inch off?
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%
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