Seems like you figured out why it broke...I have a GC 240 and have no issues and use the foam. A few things....unless I missed it in the thread...I would use the foam next time...I would be surprised if GC does anything for you cuz it doesnt seem like there fault...that un-level top plastic trim could be from it not being silicone to the glass the exact same it might have thicker silicon in areas making the plastic not straight as an arrow.
As for what to do with the now broke tank. One thing you can do is use the 3 good pains of glass and build a plywood tank using the 3 pains front and 2 sides. There is a thread on that in the DIY section I think.
As for the thickness I always have heard 25" is as tall as you want to go with 1/2" So you might want to think/look into that situation more before you build a plywood tank using the good glass. Maybe if its braced right you will be able to use it.
As for what to do with the now broke tank. One thing you can do is use the 3 good pains of glass and build a plywood tank using the 3 pains front and 2 sides. There is a thread on that in the DIY section I think.
As for the thickness I always have heard 25" is as tall as you want to go with 1/2" So you might want to think/look into that situation more before you build a plywood tank using the good glass. Maybe if its braced right you will be able to use it.
