Zoas shrinking/smaller?

[xxoczukxx]

Hi everyone, I have 4 zoa frags in my tank. three of the look normal ish however one of them has been slowly shrinking in terms of polyp size of the zoas for a couple months.

I am including pictures below. My rainbow incinerators always had small polyps but isnt growing much. I have CB rainbow infusions which are on a different ledge and are fineMy utter chaos wont stop growing and is doing well with large polyps, and my rastas are the ones struggling.

I was having a cyano issue which actually went away once I started feeding MORE, possibly due to a nitrate phosphate imbalance. I think my chaeto has picked up since then as well, so now im trying to home in on whats causing issues with these zoas.

The tank also has a few pieces of SPS which are thriving and growing like crazy.


Does anyone know what polyp size like this could be indicative of? low light? high light? low nutrients?

 

[Reefing_addiction]

Did you dip it before adding it to your tank?
I would maybe move them down on to your sand bed and see if they are happier.

I would also inspect them for pest.

 

[Trey]

In the past I’ve had zoanthid individual polyp size shrink and color intensify under high light situations..

Did you dip before adding? If polyps are disappearing it could be a pest.