Zoas haven't opened in 5 days

[Liquid Hobby]

I've had a zoa colony for almost 2 months. All has been normal and good. Now, one little colony has not opened in 5 days.

Is this a nornal thing?

 

[Liquid Hobby]

Params:

SG 1.025
Alk: 8 dKh
Mag: 1350
PH: 8
Phos: 0
trates: trace
T5 Tek 6 way.
Ocean Pure Salt
Weekly 10% water changes.

 

[Ti]

hummm
any changes made in the last 5 days?

 

[Liquid Hobby]

I did start to intermittenly use a cansiter filter (bought used and cleaned prio to use) to pick up sediment that my new goby was kicking up...

I have several other Zoa colonies (5) that are doing just fine!

 

[raider77]

Do they appear healthy even though they're closed? I just had a colony of orange zoas do the samething for about ten days. They finally started to open back up. As long as they're not melting away they should be alright.

 

[Liquid Hobby]

Not melting away. Some of them are just slightly open...

 

[geoxman]

Did you check for predators. Nudis even when small, just hatched, can keep polyps closed