Just buy Galvanized washers, I don't think I would have used quarters though the surface area is really small on them compared to the wider washers and quarters tend to slide apart even though they are taped, that glue will break down eventually.
Haha, I picked up my 75 a few years ago by hand on one side when it was full and had my buddy slide washers in.You lucked out.
This is a BAD idea. You could easily blow out a panel from the shifting weight of the water & flexing of the tank. NJMO,
Haha, I picked up my 75 a few years ago by hand on one side when it was full and had my buddy slide washers in.