Green cap has red spot on it and is bleaching

tajynuga.jpg
very hard to see with my iPads camera. My good camera is charging right now and I will get a high quality pic up in the next half hour
 
That does look like cyano. Is that the only place in the tank where you see it? I would siphon it off, fragging it is up to you. It's possible that the piece has STN, and the cyano just found an opportunity to grow.
 
I can't hardly tell where the spot is in that picture.
But,I do see a zoa or button polyp near the back.
Those will sting and cause damage to caps.
 
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