Tip Burns

I seem to have fixed the problem that caused the tip burns in the first place. Unless the burn doesn't normally spread to other leaves...
But, anything I should do to treat it?
Anything I can do to make it green again?
 

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Well, there isn't any more burning than this. It's stayed the same for a week or so.
I'd add more light if I could. But it's a ghetto rig. I'm going to go to the hardware store after christmas and get an upgrade.
Will the cut off part of the leaf regrow?
 
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