What's wrong with my zoas???

[Richieboy]

Any help would be great regarding my zoa colony. These things were thriving at one point. The rock on the right was once covered with these green zoas, but they slowly started dying off. First they wouldn't open, then they turned black, and finally they are what you see...wierd because my other zoas are doing fine, just this particular type of zoa, because I actually had 3 colonies of these, but they all had the same fate...

 

[650-IS350]

Fungal infection of type??? have you done iodine/lugols/tpmcc type dips??? did you try to frag off the good polyps and place them some where else in the tank to try to get them to thrive ???

 

[hexedagain]

It looks like you have some type of algae growing on the polyps. Try either rubbing it off, or using a soft toothbrush and getting it off. I had a colony do that with a green algae film. I cleaned them off, dipped in Iodine, and most of it made a nice recovery.

 

[twon8]

as said above, algae, you need some more flow on them and a water change or two.