So I noticed yesterday? that there is something wrong with one of my acro frags but idk what it is... At first i though could something be picking at it? but i'm wondering if something else is wrong? Here is a picture hopefully you can help me ID the problem 
Btw i did move it about 2 weeks ago to the other side of the tank about the same height though and i started dosing small amount of vinegar.
Thank you,
~Nick

Btw i did move it about 2 weeks ago to the other side of the tank about the same height though and i started dosing small amount of vinegar.
Thank you,
~Nick