Help..Fuel tank leaking from drain plug
 

We drained the fuel this weekend and now i have a slow leak coming from the drain plug. I did a search but not much. Any ideas how to fix it or should i replace the tank:(

One thing that look a little odd to me was where the drain plug goes there are 3 very small holes in the first thread going into the tank. The holes are symetrical so i assume they should be there.