Hey this happened to my center brace once,not a problem,emty the tank below half,put your corals down on the sand if you have too,buy the same type silicone or glue that is used for making the aquarium,glue it back together,when u drain the tank to below half,what it is doing is taking much of the pressure of of the front glass,allow 24 to 48 hours to dry,then refill with water and inhabitants,trust me its nothing to worry about
if u want more details will be hapy to give :joy: