Thats all I'm worried about. I think I might just use the stopper from my other tank, besides I think it looks better than the shiny lid thats on the stocker anyway. Or try to cram a 10 or 12oz. in there one of the two. I need to get my control surfaces installed first to make sure of clearance. I am waiting on Hobbico to send me the rods and tubes that got left out of my ARF.