Sorry, Erica.
E. Mito wrote

I looked at one internet picture of the Bacopa myriophylloides and the
leaves
on my plant look a bit denser; it is also supposedly a rare plant...

Not so rare. Arizona Aquatic Garden has it, for a couple of bucks a bunch I
think. I had some in a couple of my tanks but, apparently, it was delicious
and it got mostly eaten. At any rate, it was LESS dense than the frils so,
yeah, we can rule it out...

Geez, I suck at plant identification.

kush

"You can't have everything - where would you put it?"