The one bit of glass you don't wanna crack is the bottem bit therefor a
layer of styrofoam is needed.
tank bases may expand, have a bit of gravel/sand on them or just not be
level (stand or tank)
a styro sheet prevents any of these things being a problem
it needs to be big enough to fit on you stand, tank goes onto stand and any
excess styro faom can be trimmed away.
do it tho, it saves massive drama later on
massive drama!!!
:-)