Yeah, im not one for foam under acrylics over here...most tank mfg. dont know any better these days either. alot of guys i help repair tanks...had them up on foam which leads to issues in the bottom seams seperating because there not properly supported... All foam is not created equal... if there is a warranty involved id go with the densest/hardest foam available. my main point is always that foam is not a building material. acrylics are best placed directly on plywood with shims under the ply as needed. Ur basically "free floating" acrylic placed on foam. it can actually throw ur tank off level over time from the tank weight crushing the foam. Foam is for plate bottom glass tanks only to prevent the bottoms from shattering due to any bumps in the stand... acrylic is much softer and will not crack/shatter under any pin point pressure like glass... does more harm than good IMO although so many people are confused these days it often strikes a debate.
