Skinny Hammer coral tentacles

[Applegate]

Hey guys. So my hammer coral who has been doing great for months now up until tonight is looking a little funny. The tentacles just look skinny and frail. My parameters are:
No3: 1
PO4: .02
Calcium: 420
Magnesium: 1480
Alkalinity 8.4
Ph 8.2

One thing to note is my alkalinity last weekend was low, 6.7, so I have been dosing red sea foundation alkalinity to get up to the 8.4 it's at now. This over 4 days.

My reading around has brought me to a few threads mentioning hammer corals don't like low nutrient tanks. Is this the problem or is it something else?

 

[ktx361]

Mine is doing the same but my levels are all good and stable

 

[Applegate]

Mine is doing the same but my levels are all good and stable

Are your nitrate and phosphate levels around the same as mine as well?

 

[Bayareareefer18]

I would give it some time. That's a large alk swing.

 

[BadPanda]

Is the pic with the light on? Reason I'm asking is because, my hammer looks like that every before lights kick in. Also +1 with the rapid alk rise.

 

[Applegate]

Is the pic with the light on? Reason I'm asking is because, my hammer looks like that every before lights kick in. Also +1 with the rapid alk rise.

No, the light is off. I initially saw it in this condition while the lights were ramping down but didn't take the picture until a little bit later.

 

[Applegate]

I think you're right on the alk swing. Tonight it is looking better. Not back to normal but better. Scoly and bubble coral haven't missed a beat though, they look as good as ever