The one on the right is rotala rotundifolia, it may lose it's red under low light.
Middle looks like Normampha stricta Thai (spelling)
and the left could be hygrophillia polysperma rosanervig or alternathera reinickii/ or lilacina ( alternathera is hard to grow)
wow thanks so much , i was having trouble getting peple to answer , the one on the left i think i will remove, dosn't seem very happy... any suggestions to what plants are good to grow under low light but don't take over? Thanks