I used a dremmel with the tank full!! Kinda scary with water and power tools 4 inches above on full blast! If you don't put sand it till very last and don't stack rock against the overflow you can test run it to see if it even needs any opened up or not. My dremmel work is pretty shabby to say the least. And I got the cut too low and now my tank level is as low as the lowest cut which shows about 1" below the rim now . I could weld in a peice to fix that but oh well...
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