[seandelevan]

Ok what the heck is this plant? Grows ok submersed...but grows like gangbusters immersed. Can plant it or let is float....produces little white flowers....what the heck is it?

 

[OVT]

The second picture looks like watercress viriety to me. I keep it floating and it indeed can overtake a tank in no time.

 

[Centromochlus]

Murdannia keisak... maybe?
Do the flowers look like this?

 

[seandelevan]

Indeed it is. I think you nailed it.

 

[Tinanti]

That's Floscopa scandens. Same family as Murdannia keisak, which is why it looks similar.

Also, immersed means the same thing as submersed. I think you mean emersed.

 

[Centromochlus]

That's Floscopa scandens. Same family as Murdannia keisak, which is why it looks similar.

Also, immersed means the same thing as submersed. I think you mean emersed.

I knew it looked familiar! I've kept Floscocopa scandens before but never Murdannia keisak... didn't even think of the former for some reason.