Im rebuilding one of my racks right now to add more support, I had a book shelf style and now Im supporting the shelves with 2x2's and 1x4's for the legs.
Im using an 1/8 in piece of cardboard for a spacer between the tub and the shelves when Im installing them. The gap looks big to me but I cant even put my pinkie through the gap not even close, its maybe 1/2 the thickness of my pinkie. Do you think 100 gram BP's will be able to squeeze out of it?