It might be over the top, but it is the only way I can work out in to hold the braces in place without clamping them. They can not be clamped in to place as the silicon (special stuff) offer to be between the glass and a clamp would push this all out.
We have come down this morning to what atle of been a lot worse. The cross bracing at the top of my fish tank has come off! Quick call to Joe confirmed what I had to do, number one being get a clamp in place to reduce the pressure on the glass