Torch trouble algae or bjd

[Shawnman]

I have a 2 headed torch that lost all its tentacles on one head at least a cpl months ago. The other head seems to be doing fine. I didn't really notice anything other than it losing tentacles slowly. Few weeks ago I have noticed something brownish that appears to be algae to my novice eye. I only paid $67.00 for it so I am not out all that much if I lose it compared to ithers i have.

My question is should I remove it if it is bjd or leave it. All other euphyllia around it are thriving.

 

[Shawnman]