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Exactly as Rich says, it needs something solid for the roots to grab onto or it won't stay put. I have it in 2 tanks, it's tied to driftwood in both. When you do this with driftwood or rock, get someone to help you hold the plant in place while you tie it on, it can be a bit tricky to do. Don't tie to tight, just enough to hold the plant on, it will grab on in time and the thread will rot away. Good luck