KK Yuma question

[6t4nova]

I picked up this KK Yuma a couple weeks ago. It was nice and spread out for a while and now it’s shrunk up to this. Any idea what’s happening. Water check shows everything is good and other corals are fine

 

[shakacuz]

was it originally glued to the bigger piece of tile/slab? the first picture indicates it was

could be a ripped foot that became infected or allelopathy(coral warfare?)

 

[6t4nova]

was it originally glued to the bigger piece of tile/slab? the first picture indicates it was

could be a ripped foot that became infected or allelopathy(coral warfare?)

When I bought it, it was one large tile piece, however when the tile broke it wasn't attached where the break occurred. I just took it out and dipped it to see if that helps anything. Upon further inspection, the black and white spots are sand (white from my tank, black from the tank it was in prior)

Could be coral warfare possibly. The only others in the tank are multiple zoa stands, cotton candy torch, branching hammer, some ricordia and hairy mushrooms, and a duncan.