Something is causing my zoas to crumble

[glb]

Hi everyone. I have a zoa colony that's been in the tank for almost three months. It thrived for a long time and is still growing new polyps. However, some of the polyps in the middle have crumbled. Has this happened to anyone else?

 

[Mr. E Wrasse]

What do you mean by crumbled? Like broken apart? I haven't herd of something like that happen. Maybe melting away

 

[glb]

It was in the middle of the colony. I didn't notice it at first because the polyps were close together. But one morning before the lights came on and the polyps closed, I notice that some were gone and the residue was a tan crumbly material. I dipped in Coral Rx today and nothing came off except amphipods. It's weird, the outside of the colony is still growing. I haven't moved it and the other zoas in the tank are fine. There's an acan lord a few inches away but its tentacles don't get anywhere near it and there are other zoas close by that are fine. I just can't figure it out.

 

[Mr. E Wrasse]

That's very strange. I have no idea what could do that

 

[glb]

I know right? And they haven't reopened since the dip. The other ones I dipped have. I have no clue what's going on.