Duncan coral turning brown

[shaneschex]

As the title says Duncan has a little brown spot on him and the skin is turning brown all my other corals are doing fine (candy cane, gsp, hammer) he has closed up also and this morning closed tight last 2 days been semi closed up. Had it for about a week now sits on the bottom of the tank in the sand bed I did see a sand sifting starfish right next to it one day when this seemed to start it had its arm on the side of he plug like he just got down off it maybe.

 

[Reeflix]

i cant really give much help (my best guess is bjd but i dont think so) but i can give you a bump so maybe you can get some help!

 

[shaneschex]

i cant really give much help (my best guess is bjd but i dont think so) but i can give you a bump so maybe you can get some help!

I just moved it to a tank that has no other corals it still eats food the spot hasn’t gotten any worse I did notice there is a new moth forming under that spot maybe that is what’s going on I hope