Some zoas cupping/stretching

[Pennywise the Clown]

Some of my zoas are cupping and stretching.
It's not all of them though, some colonies at the same level in the tank and even on the sand bed are perfectly fine.
Any ideas?

 

[James M]

They’re stretching for lighting. Move them up higher

 

[Pennywise the Clown]

They’re stretching for lighting. Move them up higher

Thanks.
I did think that but my lighting hasn't altered intensity. One of the colonies is on a loose rock so I've just moved it up to see if it helps.
The only thing that has altered is that I have upped the flow in my display after adding my first sps.
The zoas aren't getting battered by any stretch of the imagination but there is enough flow now to move them around a bit.

 

[extremetang]

Thanks.
I did think that but my lighting hasn't altered intensity. One of the colonies is on a loose rock so I've just moved it up to see if it helps.
The only thing that has altered is that I have upped the flow in my display after adding my first sps.
The zoas aren't getting battered by any stretch of the imagination but there is enough flow now to move them around a bit.

Need light. Zoas can handle high flow.