Zoa Colony Dying?

[Nigel35]

I had a great zoa colony growing and just a little while ago they have started to close up and I think even melting has occurred. It only started with a few and then zoas around the tank followed the same pattern.

Parameters as of today:
Nitrate: 20 ppm
Phosphate: .25 ppm
Calcium: 440 ppm
KH Alk: 9-12 ppm
PH: 8
Salinity: 1.025

I have seen some asterina starfish on the polyps, could that be the issue? Thanks!

 

[vetteguy53081]

I have had nightmares with asterina and zoa together . Also check under plug for black bugs or any other s.

 

[sfin52]

I had a great zoa colony growing and just a little while ago they have started to close up and I think even melting has occurred. It only started with a few and then zoas around the tank followed the same pattern.

Parameters as of today:
Nitrate: 20 ppm
Phosphate: .25 ppm
Calcium: 440 ppm
KH Alk: 9-12 ppm
PH: 8
Salinity: 1.025

I have seen some asterina starfish on the polyps, could that be the issue? Thanks!

Did you dip

 

[Nigel35]

I didn't. Is there a particular one that has worked for you?

 

[Zoa_Fanatic]

Asterina eat zoa. That’s your issue. They’ll slowly eat away at the colony at night and you’ll never see them most of the time until the zoa are dead. Get a harlequin shrimp or pull them out by hand. I kill every one I see