Yes, 90% of those rocks are well away from the back wall. There are a few that are pushed back and touching or nearly so just to gain real estate at the front for the gobies, nothing's balanced on the back wall. That said, I have rocks touching the back wall from top to bottom in my 30g because the tank is so narrow front to back. IMO it's not a problem as long as it's just contact and you're not relying on the glass to hold things up.