Just give it good water quality, proper light and flow and you should be good to go. I got a leather frag for free from my
lfs that looked about dead so I brought it home and just put it in my tank with some hope that it would get better. Now its doing awesome. I didnt treat it with anything different or add anything. Just let it be and hopefully it will pull through. It may take a couple months so just be patient.
HTH