I have a scratch about 1 foot long on the inside of my aquarium about 1 foot long and about 6 inches from the top of my tank, about 4 inches in water. I can feel it with my finger tip. Is this a cause for concern of breaking. It's a 90 gallon glass tank and the glass is almost 3/8 thick. I put marks on my tank to see if it spreads. I am very worried. Thanks for your input.
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