Hey guys I researched through the archives for awhile on this and it got me more confused on the topic. I've always had glass tanks that were rimmed so no need for styrofoam. I have 2 tanks 450 and 600. 10x4x2 and 10x3x2. both are acrylic and will be sitting on top of a homemade stand with 3/4" shop grade plywood tops. Is styrofoam the way to go under the tanks for these setups? How thick should it be. And I saw several different types listed. What is the best type to use. Thanks in advance for the help