Zoas....dying a horrible death?

[Starry Night Reef]

Can't seem to figure out what's going on. All my zoas have been growing like weeds.. recently they've started.. shriveling? Twisting? Whatever it is, they're losing color as well. All other LPS are doing great, great extension and color.

I think only changes to my tank have been the addition of an older used gyre 2k...

Could stray voltage cause this?

Any other ideas?

 

[aray]

Any change in your regular parameters? I know you said the only change has been the addition of the gyres, but my zoas sometimes tip me off to something being out of whack before anything else

Have you inspected for pests? I will use a flashlight every so often and inspect everything a couple hours after the light go out, just to keep any eye on if anything is going on