Looking really good! I lovethe shrimp!
IMO, I think you should have some form of plant/hardscape which reaches the water line (or just below) on the left hand side. I would do something like vals or even something unusual like an Aponogeton madacascariensis. I knkw they aren't the tallest, but, IMO it would look great. Another suggestion from me, possibly (try) grow some plants off/out of the background? I don't know the texture of it, but if you could pull it off it'd be great.
As for the pike, I typed it in on google and it came up with all sorts of gars!? Had me worried!