I trim my leathers on a regular basis and they keep coming back.
As was stated, if tank is healthy, your leather will recover. In fact, now you will have 2 of them. I have even seen leathers in bad shape, that once the tank parms got back to shape, recovered from near "death". Leathers are very hardy. Just make sure you mount the leather to live rock.
I even had one leather that became top heavy and ripped down to a lower level of rock. Now, the thing is even bigger.
Good luck.