How can you keep stringy plants planted?

[evil Nick]

So I got a micro sword a while ago and it lasted a week before each blade popped out and floated away. I recently got a baby tear which now does the same thing. I guess the roots on these plants aren't not really bunched and each blade is its own thing?
Can the bases be rubber banded then planted to keep them together as I do like the way these look
Thanks

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[RevLine]

what kind of substrate do you use, gravel? what size is it? usually smaller-sized gravel is better for roots to grip onto.

tying them together isn't a bad idea. i used plant weights i got from the LFS in my experience and they do fine with shrimp, snails, and fish.

 

[evil Nick]

what kind of substrate do you use, gravel? what size is it? usually smaller-sized gravel is better for roots to grip onto.
.

gravel now, will be switching to dirt/sand soon