I was just curious about what you guys use to protect the glass on the bottom of your tank. With african cichlids it is important to have a protective layer between the glass and gravel because they like to dig a lot and there is a possibilty of a rock sliding down and cracking the glass. Before I have had an UGF and used this as protection. But my new 75 gallon setup is going to have an FBF instead of an UGF. I've heard to use styrofoam but won't it dissolve and leech chemicals in to the water? Or is there an aquarium safe one? Any help is appreciated! ;D Thanks!