I think I've cracked it now. I'm pretty happy with how it looks. Added a second bag of AS, it must be about 6" deep in the back right corner! I might mine some out some day and pad it with some sand, cheap skate that I am
Anyhow, I've tweaked the left rock in a smidge, and raised it, along with the back "peak" rock, infact I've rasied them all a tiny amount. I've also added a small accent rock left of the main left rock, which I think works but I'll probably bow to opinion when I'm able to post a picture. I didn't realise but I've left my memory card reader at work, so no pics till monday, unless I use my iPhone camera, which is crappy at best!
You'll just have to take my word for it, it looks a little better now
Thanks for all the input guys It's weird to think I wasn't aiming for a 'gumi scape originally.
I think I'm starting to get an grip on a planting scheme. I've changed my TGM plant order to include 4 pots of HC. Not sure it's going to be enough, but I have a little more floating in my storage tank at the moment. Obviously the HC will be all up front and around to the left. Next, around the rocks will be Downoi, and I'm also playing with the idea of Staurgyne around the rocks too. Then, at the back right, behind the rocks, I'm thinking Bylxa. Then behind the rock at the back and moving to the left maybe the E. acicularis.
Remembered to upload a better hi-res photo The rock on the right has been moved a tiny amount to the right and opened the gap between it and the middle rock by maybe 1cm at most. Just means I can plant into that bit a little easier...