I got a 125gl tank from a friend of mine. I built the tank in the wall after everything was almost complete I noticed a hair line crack. The crack is on the front panel on the lower right about 1" up from bottom. This crack is about .125 long you can't feel with your finger on the inside or outside and doesn't go completely thru. The glass is .375 thick and the crack looks less than .125 deep probaly half that. I really can't tell if the crack is on the inside or outside. I wanted to see if anyone had this problem and if it will it leak or crack? I didn't fill yet so I was wondering if I should use this tank get a new one or do a test run with fresh water before switching over my fowlr tank?