But, if it is cracked, can't you just use a piece of glass and silicone it over the crack? Or, will it still effect the structural integrity of the tank?
It doesnt go through the glass its only on the inside so im thinking its a scratch. Because i bought it used im keeping it outside filled up for a week to check for leaks.
If it's in the middle of the pane I don't think it's a crack.
If it's near the edge it could be a crack.
A crack usually comes from the edge, due to something chipping it or set up wrong.