lotus tuber

I salvaged just two tubers from a tub of lotus that took over my pond during
the past two years.....it had jumped the pot with several tubers running almost
the entire length..."now why is that lotus leaf coming up way over
there"......my son and I battled the tubers, reclaimed the pond, and I have two
small reasonable sized tubers I want to put into the big tub and start over.

Any ideas on how to pot these tubers? They are in a tub of water....beginning
to show signs of life.....

Thanks
Maureen