One thing I have never been good doing is the rock work. I have plenty of rock, but I always end up building a wall. How do you get the rock work the way you like it? I have tried epoxy, plastic pins, and zip ties. Nothing ever looks good. Tank size is 48x23x30 150g tall.
I think that the shape of the rock plays a huge part. I try to avoid rounded rocks, if the rock is too round I break it up. I also like some negative space. Avoid bringing the scape up to the same level, peaks and valleys are more aesthetically pleasing to me.