I have just got 6 x 48cu 3000psi (0.8l) bottles, I know that the bottles have to be tested ever 5 years and these ones are in date. But do they require to be stored in any special containers (metal locker?) and marked as so in case of fire? Or is that just best practice and not required due to the limited amount held? Any help most welcome on the best place to get the information.