I would also say the Nymphaea is a drag especially if you are following one of the aquascaping techniques. I think it looks kindda like the 'Triangle' formation. So therefore, when Nymphaea becomes somewhat tall, and also its reddish color might avert viewing eyes from fully enjoying the whole 'scape. I think you could try moving it to the far left and let its leaves sorta drift nicely, either with its submersed leaves or with its floaters. Other than that, time is everything I really like the layout I cannot wait to see the foreground fully covered by the plants.