Coral - Brown algea

[revo01]

I'm not sure what is happening but the coral started to turn brown at the bottom left.
How can I get rid of this?
thank you

 

[Oscar47f]

Could be a form of brown jelly disease, i would take the coral out and dip it periodically with an iodine based dip.

 

[revo01]

Could be a form of brown jelly disease, i would take the coral out and dip it periodically with an iodine based dip.

I do have iodine. But how water to iodine solution and would this be once a week?

I already tried coral rx and it did not improve. I also tried brushing the brown stuff off and no luck.

Thank you