Looks like Hydrocotyle umbellata. It grows in aquariums and as a house plant, so you can plant it both ways . By the way most plants in the hobby are not fully aquatic, instead they can grow either emersed or submersed, like H. umbellata.
Edit: Was doing some reading and am unsure now whether this is H. umbellata or H. verticillata. If anyone would like to confirm the difference between the 2 that would be great. I think verticillata is shorter. Nevertheless both can be grown in your aquarium.
No worries hahaha! Wasn't holding my breath! I found H. umbellatta in my garden, so I always have a free source I guess. Perks of living in SE Asia. The pots sound pretty neat.
How's it growing in your tank?