tank glass crack

I recently got a jbj rimless 65 gallon aio aquarium and found out that the glass thickness is 10mm. Is this glass thick enough or is it dangerous ?

I recently got a jbj rimless 65 gallon aio aquarium and found out that the glass thickness is 10mm. Is this glass thick enough or is it dangerous ?

I recently picked up a 95 gallon cube at a great price but upon working on taking out the old silicone to replace it with new silicone and scraping off the black back that the previous owner had painted I discovered this crack at the bottom of the overflow corner. How concerned should I be that...