Hole in my fuel tank

[Head Bone]

Hello, 
So after much head scratching wondering where my fuel was leaking from, I located a tiny hole (2-3mm) in the bottom of my year 2000 Fazer. In the area where its close to the bike frame. 
Rather than buying a 2nd hand tank, is it possible to get a weld on it to seal the hole? 
While I'm here, any advice on how to get the crap and gritty rust out of the tank?         

[Post moved to General Chat: GrahamM - Moderator]

[Grahamm]

If it's rusted through, I'd be concerned about what other damage is not visible inside the tank.

Simply patching one hole isn't going to fix the fundamental issue.

[Head Bone]

I see what you're saying, and I've thougt about buying a replacement. The one I saw ebay this morning was in much worse condition and were asking £115.00 ?
Maybe that's the going price?