I just bought 400lbs of rock for my 150 gallon tank. I'm not going to use it all but I hope to use most of it. Foot print is 48x24x31. Should I worrie about the bottom breaking out? It's Sitting on a very sturdy stand. It will be evenly dispersed. Here is a picture of my 125 long it has around 200lb of rock. planning on same setup just taller. Thanks