Hammer Coral help

[Nathan73]

Hey guys, I’ve had a hammer coral for 2 months now, and it was looking great, at the start of this month it looked as if it was getting bigger, and now in the past two weeks the front edge hasn’t been extending and is retracted into the skeleton.
at first I thought maybe my clowns or snails had been annoying it but it’s still not fully extending.
I noticed my alk had dropped to 6DKH and have slowly raised it to 7.5DKH with a target of 8, this has shown some improvement but still not what it was.
Other parameters are :
Ammonia - 0
Nitrite - 0
Nitrate -5ppm
Phosphate -0.03ppm
Calcium - 440ppm
Today I have turned off one wave maker to see if maybe it was getting too much flow
Any help would be appreciated, please see the below pics
Thanks

 

[blaxsun]

Are you supplementing with anything, ie: Red Sea Reef Energy AB+, etc?

 

[Nathan73]

Hey, nope not supplementing with anything like that as of yet