While I am waiting for my tank to arive I have been tinking of some aquascaping. My design that I am foinf to go with is a large center piece with three archways ataching to the center piece at different hieghts on the main tower. The tank is a 200 gallon pentagn corner and my main concern is the rock falling over and damaging the tank. How do you guys mount your rock formation? Keep in mind that I will have a coral catshark in the tank. I have been dong some reading and haven't found anything good. The only one that seemed appealing to me was the drilling of the rock and inserting acrylic rods into them, but I need more info and will this be able to stand against a shark? Thanks in advance for any input.