I bought a tall plant from Walmart thinking my tetras would love it, and pit it in the tank. They do seem to like it, but as I was researching what it could be (Walmart doesn't label their plants), and after a LONG time of googling random words, I finally found the name: bacopa cordata. That was a big relief until sites started listing it as a TERRESTRIAL plant, with no note at all about submerged use. Should I return the plant (if I can...), or will it be able to survive underwater? The top kinda lays at tue surface, so it has a little exposure to air.