if plants will be in with big fish that may toss them against the walls, just don't fuse them to hard things like rocks.
you can stick the stems through a slit in cupped-up plastic, then silicone under that. almost any old water bottle or food container will be enough to hold a good scoop of weighty sand/gravel. or use chunks of driftwood for natural look when exposed.
I read somewhere that you can use a glob of silicone on the end of the plant and mix it in with a bunch of sand to create a base. Anyone have any idea how effective this is?
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