Damsel with swollen eye

Hi,
I am cycling my tank with a yellow tail damsel I bought him 3 day ago and this morning one of his eye is swollen.
I did a little bit of reading and it seem to be cauce buy him rubbing on a coral or a rock am i correct? Wich he has been hiding a lot that would make sense.

Now I also read to let it be or use medication what should I do?
And also somebody said something about garlic to boost immune system how do I do that?

He is my first fish I want to take care of him so please help?
Thanks

 

Ho and he is healty looking what it is?

 

I'd say let it be. Since you are cycling your tank, your parameters are nothing but stable. If you want to save him, give him to a fellow aquatic for a while or set up a hospital tank with filters from an established tank.

 

It's popeye and is probably associated with the less than good water conditions. Fish Pop-Eye