Zoas not opening

[Brosensetin]

Hey everyone! Tank has been set up for about 6 months now. Fully stocked and, for the most part, looks good. Main issue I’ve been having is that my zoas/palys aren’t opening as much as they used to. Torches, acans, and mushrooms are all doing amazingly. Any insight would be helpful

 

[NAS]

Check your alkalinity. What are your parameters.

 

[chaples55]

I've had zoas close and shrink due to irritation from spaghetti worms.

 

[AWarnick]

The above are all good suggestions, I also had difficulty with some zoanthids if they were getting too much light. Some are light loving and some are not and most can adjust with a lot of time. Other than that mine seem to grow most when there is plenty of flow, nitrates and phosphates.