Quite honostly I was amazed that it wasnt in the rules before.

My main concern isnt that a robot leaks in the arena, but in walkways where people with heavies have to walk backwards to get their robot in the arena, one splash on the floor and there might be a serious problem.

I will leave it up to you to make it a rule or advisory only, but I would recommend to at least have it black on white. The amount of hydraulic robots will increase, and I want to be ready for it should something happen.