Plant identification help.

[fishkeeper43]

Hey guys I recently purchased these aquatic plant from somebody who was selling them but didnt identify them. I also went to local pet stores and they did not know what it was… (the ones at the front and at the back).
Your help would be very much appreciated!!
Thank you! Also was wondering if they could survive in sand or need a proper substrate.

 

[MaloK]

Looks exactly like Roundleaf Lindernia (Lindernia Rotundifolia)

 

[Colin_T]

It looks like 2 types at the front and the purple one at the back. The purple one is a garden plant and will probably rot over the next week or two. The other 2 should be fine.