Less is more

[Aquattro]

Marie, nothing wrong with that at all, although mechanically, the more rock you have, the harder it is to keep clean and well aerated. I had more rock than water in my 155g, and eventually all the life you describe died from lack of clean algae-free rock to graze on. There comes a point where there can be too much (to filter and keep critter friendly).
There is a guidline of 1 to 1.5 pounds of rock per gallon, which is reasonable, I'm just saying try not to go much beyond that unless you've planned flow and detritus removal accordingly. Again, YMMV.