The rotala rotundifolia is a good choice. I have this in my 10g and I LOVE the way it looks. Great job!
Only problem now is i got baby plants of rotundifolia and green rotala and both are mixed up.. Tomorrow will have to look at the leaf structure and see which one is which. I believe rotundifolia has 3 leaves and green rotala has 2 leaves at each point..
Will also need to sort out through things that i took out of the 10g and put them up for sale..