Hi Ramsey!
There aren't many things finer than a cycling tank without a bunch of stock muckin' things up! :cheer:
I would try to stack those rocks so they are solid and won't fall or shift. I know it's tough to do sometimes with a 55 because they are so narrow, but that set up doesn't look safe for your future pets.
You can stack against the back glass.
What stock plans do you have?