Hammer coral only 3/6 open

[ganreef]

Hi, just noticed this today. The 6 headed hammer coral was doing fine until yesterday and today only 3 are open and 3 are not fully open. It used to be in full bloom always. All other corals are fine.
Water parameters all check out fine and only did a water change yesterday.
Appreciate any thoughts on what could be wrong. You can see photo of closed and open heads.

 

[blaxsun]

How's your lighting and flow?

 

[ganreef]

Thanks. Same as before when it used to be open. Radion G5 pro and ecotech mp10. Afraid to crank anything up because it may impact other corals. Should I wait for two more days to see how it is reacting ?