Other options is if you have driftwood that sinks, you could drill tiny holes in it where you want plants to be, and clip the base off the plant and silicone it into the driftwood. I've even seen the same done with slate, where you can just bury the slate under the gravel, and the plant won't go anywhere.
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55G Filstar XP3 - 16" Fire Eel
75G Medium Planted - Filstar XP3 Low Light - Established Feb 2006
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