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I can't speak the crypts and swords (sounds like a gang war) but with Anubias you just cut the rhizome when it's big enough. Make sure the section you cut has both roots and leaves though.
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Yelling into the tin can from the far end of the string
Crypts and swords send out runners that you can snip and replant. Or let them sprout and grow wherever they drop their roots. Sometime very thick crowns can be separated and replanted.