ok guys, I was curious about the whole "egg-crate" deal. I am looking to stack lots of rocks in my aquarium and would like live plants to accompany them. I have heard that egg crates would help to stablize the rocks and prevent them from cracking the tank. Are they 100% necessary? I just don't want the plants' roots to wrap around the egg crates and make it difficult for me to remove them from the tank for a thorough cleaning or transfer. What should I do/use to keep the wall of rocks supported without cracking the bottom?