Ive Seen It Done Before, Actually I Use A 31 Gallon Rubbermaid For Large Water Changes. The Only Problem Is That The Sides Bow Out From The Water Pressure. What I Did Was Took A Roll Of Duct Tape And Wrapped It Around The Rubbermaid. Do It In A Bunch Of Directions, Top To Bottom Across It, Then Top To Bottom Length Wise, Then Around The Sides Of It. I Actually Used A Whole Roll Of The Tape, Just To Be Safe.