Yeah.. I had several laundry baskets of rock in that thing before I realized how much it was going to take to build a display... you may want to consider making a manmade rock panel for that end, and hanging your rock on it... Dan made one for his system, and if he does not break it before it gets in the system, I think it'll look great...
Besides, if you made a larger portion of your rock, you could just cure it in the tank... and flush the water....
J