Hammer coral closed up with mouth open help

[nanofishtankenjoyer]

Hi, my hammer coral is not extended with mouth open, the water parameter are 8.4dkh akalinty, 450 calcium, 1600ppm mag, and 1.023salinty with nitrate below 25ppm. Please help!

 

[vetteguy53081]

Hi, my hammer coral is not extended with mouth open, the water parameter are 8.4dkh akalinty, 450 calcium, 1600ppm mag, and 1.023salinty with nitrate below 25ppm. Please help!

It is stressed and assure youre providing moderate light and water flow but the issue I see likely causing this is Low salinity ( you want 1.025-1.026) and Very high mag (best range is 1300-1350) and up to 1450 is acceptable but 1600 is Extremely high.
Assure also that phosphate is not elevated