Bacopa caroliniana
http://images.aquaria.net/plants/Bacopa/caroliniana/

There are hundreds of species of Bacopa worldwide but only
half a dozen are usfeul in aquaria. The two overwhelmingly
common forms are caroliniana (the old "B.amplexicaulis")
and monniera, whic is less common and has smaller leaves.

Also called "Giant red Bacopa"

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