tank holes

With the right tools...not very. Its all about the thickness of glass or acrylic, no pressure, water to keep heat down and not going to fast.
 
They have specialty ones for glass. You can order them online fairly reasonable.
 
Diamond tip hole saws for glass... Watch some YouTube videos I would build a dam with clay to hold the water in and drill it out... Pretty painless granted its not tempered that's a whole other story haha...
 

WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

  • A fish’s behavior or appetite changes

    Votes: 12 15.8%
  • A coral looks different or stops opening normally

    Votes: 46 60.5%
  • Water clarity or surface appearance changes

    Votes: 11 14.5%
  • Equipment sounds or flow seem different

    Votes: 8 10.5%
  • A test result catches my attention

    Votes: 16 21.1%
  • Algae or other growth starts changing

    Votes: 15 19.7%
  • I usually notice when the problem is already obvious

    Votes: 4 5.3%
  • It depends on what’s going on

    Votes: 16 21.1%
  • Other (Post in the comments)

    Votes: 1 1.3%
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