As I was scrolling down, I had to do a double take!
LOL!! I saw that you got your hardscape in a few days ago, but I was shocked when I saw the tank "planted".....I thought to myself "Holy CRAP that's nice!" and saw that you Photoshopped that in.
If you get your HC to grow like that, I think that will be pretty nice looking! I don't think that you need to add anything else....keep it simple! Therein lies the beauty of Iwagumi, right?