Google Hydrocotyle (sp?) pics - or try plantfinder or plantgeek - I think that's what the mystery plant is, not sure abt species.
3WPG, if it's not actinic, might support HC. Some Myriophyllum or Cabomba might be a good "test plant" - if either or both of these grow, you may get HC to grow in unshaded regions of the tank.
3WPG, if it's not actinic, might support HC. Some Myriophyllum or Cabomba might be a good "test plant" - if either or both of these grow, you may get HC to grow in unshaded regions of the tank.