My experience with this, though mine was a minor tear is that it healed on its own. I guess determining your tanks parameters/maturity it could heal on its own. But just be ready to treat upon first signs of trouble.
edit: I'd also question your parameters if it moved after 3 months, moving LTAs is usually a sign of distress or very high flow or high linear flow (I know personally they can cope with high non linear flow once settled). I would look into what the cause of the movement was.