Plant id please

[CrashCourse]

I got this plant (the reddish one) from petsmart, in one of those snail-free bags. It "says" it is fully aquatic, but I can't remember what it's called. I should start taking pictures of the labels...
Anyway, it seems to be growing, and I think it looks good, but it sheds a lot of leaves. I'd like to find out if this is normal for this kind of plant, if it is unhealthy, or possibly not fully aquatic.

I can move the one in front out of the way if anyone needs a better picture.

Thanks!

 

[Rivercats]

It kind of looks like Telanthera Rosefolia (Alternanthera reineckii).

 

[CrashCourse]

Rivercats, you are awesome. Thank you again.

First google results say leaves can fall off in low light, which is what I have. Much appreciated.