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the top is well support, and it is only noticeable because it has a kinda magnified (like a bow front you have to look at it just right to see the bow!!
It's normal. I have a 180 gallon made of 3/8" plexi it bows maybe 3/16". My other 180 is made of 1/2" plexi it bows about 1/8". I'll bet the glass tanks bow some too.