i think what the op meant is if he/she should put a mat or some sort between the tank and the surface of the stand where the tank will be sitting. many people use foams because they're afraid some grains of sand, dust might be trapped between the tank and surface(plywood?) and causing stress points. people use white foams(styrofoam) might promote mold growth if water get into it, black foams(rubber base so do not absorb water as they say), and pink foams(closed cells stuff so might not absorb water, i'm not sure what it is made of though). my stand is a diy stand. i use plywood as surface and lay a styrofoam on the surface before placing the tank on it.