Yep, definitely get a lot more live rock. From your post about sand, I'm assuming this is the live rock from your old 5 gallon reef tank, so it's about 5 or 6 pounds?
What kind of soft coral is that? looks like polyps.
From your pic, the stacking looks a little unstable, you really don't want it falling on your heater.
I use Paint to size my pics... only image program i really know how to use. I resize the image by selecting all, strech/skewing it, then size it by percentages. then i go into attributes and see the total file size.
i use a silver mirrored background on mine, but honestly, i like the corraline/random algae and stuff growth just as well.