It's sad when the home owner knows more the right way to do it then the person who installed the floor.
The bad thing is anything you now use to fill that gap will stick out like a sore thumb and it would need to be flexible so it did not crack as the wood expands and contracts.
The bad thing is anything you now use to fill that gap will stick out like a sore thumb and it would need to be flexible so it did not crack as the wood expands and contracts.