He'll be alright. If you notice, I pulled that tub all the way out and set it on the floor. (that tub is the top tub in the rack, and I couldn't get a good pic from the ladder because they were in the back) After I took about 20 pictures, I picked the tub back up and slid it back in. They never moved an inch. There was an intense level of concetration in that tub.