I am re setting up my 450gallon in the garage and it's sitting on a custom made steel stand but the floor is completely uneven. I shimmed all 4 corners but I notice in the middle there are huge gaps. So I shimmed where all the main bases are on the stand but there are still gaps in between the bases. Is this safe to leave those gaps? Or should I place ply wood or styrofoam in between leaving no gaps? Please help thanks.
