Regardless of the actual species, the Echinodorus in #4 is likely to grow very big so keep that in mind (a good rule of thumb with Amazon swords, although not without exceptions, is that thin leaves = stays small, wide leaves = grows big). E. bleheri can grow almost a meter high with leaves the size of a big man's shoe. They'll be difficult to move once they get bigger because their root systems get absolutely massive. It might be better to plant it near the sides or back of the tank.