leaning rock on glass

I've have a huge rock leaning up against the glass for 2+ years with a big rock on that putting even more weight with no problems.
 
U seen my tank. No prolems yet. I think of it like the five sides are all glass if it wasn't made to hold rock bottom would be other material
 
Ok it's because I have a smaller tank and I've seen some nanos glass broken from it


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only time it will break the glass if it tumbles into the glass. if you have huge snails or something, that's really the only reason it would get tumbling in your tank.
 
My back glass i leave dirty so all my cleaning critters have something to clean and eat algae from.
 
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