Since it is going to have approx. six inches of water and the crack is about three inches high, there will be only .110 psi exerted on the crack. Basically you could say there isn't going to be any stress on it.
But still, just to make everyone happy you should fill it outside and let it sit for a month...during the middle of winter. The expanding ice will finish it off.
Or you could just put some silicone over the crack and forget that it ever happened.
But still, just to make everyone happy you should fill it outside and let it sit for a month...during the middle of winter. The expanding ice will finish it off.
Or you could just put some silicone over the crack and forget that it ever happened.