It would be safer if you can transfer the weight of the container to the frame of the tank. I am concerned that too much weight resting on the central brace may break it off one day. The central brace holds the front and back glass pane from bulging and is not designed to take weight. A broken central brace can lead to leak development on the bottom seal due to bulging movement. Even without overburden weight, the central brace of some big tanks broke off over age and must be repaired promptly to prevent leak development.