Help Hammer coral not happy

[ALAMOBIKER]

Hammer coral not opening and showing skeleton. What would cause this? Found my salinity was low at 1.20 so I made the proper adjustments to 1.26
My cal was at 300 buffed it to 400 ph is a little low 7.8

Pocket Marine Parameter Test Results from 2021/01/09 at 10:00

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	Recommended	Result
Temperature	23 - 27 / 76 - 79	76.8°f
Salinity	1.022 - 1.026	1.026 sg
Ammonia	Undetectable	0.00 ppm
Nitrite	Undetectable	0.00 ppm
Nitrate	0 - 5ppm	0.00 ppm
pH	7.8 - 8.4	7.8
Calcium	380 - 450ppm	400 ppm
Magnesium	1250 - 1350ppm	ppm
Alkalinity	7 - 12dKH	9 dKH
Phosphate	0 - 0.03ppm	0.00 ppm
Iodine	0.06ppm	ppm
Strontium	5 - 15ppm	ppm
Silica	0 - 2ppm	ppm
Boron	0 - 10ppm	ppm
Iron	0.000006ppm	ppm
Sodium	10,800ppm	ppm
Potassium	390ppm	ppm
Copper	0.0009ppm	ppm
Nickel	0.0066ppm	ppm
Zinc	0.005ppm	ppm
Aluminium	0.001ppm	ppm
Sulphur	905ppm	ppm
Lithium	0.170ppm	ppm
Beryllium	0.0000006ppm	ppm
Mercury	0.00015ppm	ppm
Cobalt	0.00039ppm	ppm
Cadmium	0.00011ppm	ppm

 

[Spare time]

0 nitrate, 0 phosphate, both of which are crucial to the corals (at least some required in our tanks unless the corals are consistently fed), and a pH that is very low are all possible causes of unhealthy coral. Consider feeding more or using some sort of coral food. I would also consider something like brs soda ash for alk supplementing (it can help with pH) if you do currently dose alk. What kind of tank do you have (all in one, sump, etc)?