Hammer coral not looking good

ahill25

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So I've had this hammer for about 6 months and just this past week, it has shrivled up and I can start to see the skeleton. What could've caused this and is it dying? This is one of the oldest corals I have and don't want to lose it!

ph: 8.4
ammonia: 0
nitrite: 0
nitrate: 5.0
phosphates: .25

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Aquarium Specialty - dry goods & marine livestock
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REEFTIDE

MONTANTK

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I currently don't have an alk or mg test. My Ca is around 420.
I highly recommend testing Alk (KH) and Mg as those are very important to monitor with LPS and SPS. Swings in Alk can cause a lot of stress to your coral. If you have had it for 6 months and it’s suddenly not looking well I would suspect it’s nutrient/element related. Your phosphates are also a little low
 

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