Cryptocoryne spiralis - ready for transplant?

[dSerk]

My spiralis has put up some daughter plants, and I'd like to get rid of them, but I'm not sure they're, um, ripe.

The taller is about 7-8" and the smaller is about 4-5". How much rhizome should you cut? How big should it be before you should transplant?

[Ghazanfar Ghori]

Just sever the runner between the mother and daughter plants, sorta like an umbilical cord, rest should be good to go.