Oh no - problem with our fav Yellow Leather Coral
 

Hope someone can tell us what is happening. These yellow lines first started appearing 3 days ago. Today, there are some spots along the yellow lines where the coral flesh is gone - like a small sore. We've had this coral for 2 years and really hope you experts can give us some idea of what's happening and what we can do about it. Thanks.

http://pansy-paws.com/aquarium/images/leather.jpg

What type of flow do you have in the tank?
How big?

My big finger leather I have in my refugium started doing this and I increased the flow and it's all better now.

Im not sure but cant you make a strong solution of tank water and iodine in a cup and use a syringe to administer this over the coral? Maybe someone can verify this.

when mine did that I gave it more flow and more light and it recovered nicely.

Steve