Does a tank need to sit on a platform that is perfectly flat?,,,,,for instance,,,if i put a 108 gal. tnk on a stand with 1/2 inch plywood as a top ( we all know that its not perfectly flat),,,is ther any risks involved,,,,,,should i get a thick peice of that white shelving material,,,,of some 1/8 inch foam that goes under laminate flooring?