What Should I Do

The title says it all.

 

looks like rtn the only thing that may help it is a high concentration of iodine in the form of a dip i use logols 20 drops per 1/2 gallon of aquarium water for 15 minutes everyday for 3 days good luck

 

Thanks pro.

 

OR, save and cut the peice that has flesh still.

 

First take a better pic. LOL jk but really before you do anything test that water. Check your alk, ca, and pH most importantly. If they are going down hill then it might only start with a few frags, but you won't know till you test. Then a dip.

 

I did.
Cal - 420
All - 8.3
Mag - 1300
Nitrates - 2-5 ppm

 

How's this going? Did you dip, has it stopped receding?