Alternathera reineckii
it is a true aquatic plant that requires bright light and iron rich substrate.
Cris

In article , (Flash
Wilson) writes:

Can anyone help me ID this plant? It comes in large red variegated
stems, and fails to root before my pleco has ripped it to ribbons,
so I guess it's not a true aquatic?
*Snip*
It came as part of an unlabelled collection.
Photo in the semi-eaten state(!) www.gorge.org/fish/eatenplant.jpg