Hello, I am very new to reefing. I just got a 46 gallon tank the other day. Right now my tank has 43 lbs of live rock in it. I have an in tank skimmer, and I want to hide the equipment from view the best I can. As such, I have stacked some of the live rock on top of each other to create a tunnel and a higher wall to mask part of the skimmer. I added sand to my tank after I placed the bottom rocks, to help with stability once I introduce fish into the tank. My LFS told me that this stacking was okay, but I wanted to see other's opinions. I heard that there is aquarium glue, would you recommend this to stop the rocks from falling and crushing fish/coral once I eventually add them into the tank? Thanks!