Coral bleaching or WORSE?

[anthonys8107]

Woke up and my Blueberry Stylo looks like this. It happened overnight and it seemed ticked over the past couple days with all it’s polyps pulled in. Is this bleaching or is it something else more concerning? Thanks.

 

[Dburr1014]

Woke up and my Blueberry Stylo looks like this. It happened overnight and it seemed ticked over the past couple days with all it’s polyps pulled in. Is this bleaching or is it something else more concerning? Thanks.

Parameters
Changes recently?
Par and flow.
Age of tank
Age of frag

Need so much info, anything you can remember.

If it's rtn, may need to clip a couple frags and dip.

 

[anthonys8107]

Parameters
Changes recently?
Par and flow.
Age of tank
Age of frag

Need so much info, anything you can remember.

If it's rtn, may need to clip a couple frags and dip.

As of two days ago:

Ammonia, zero
Nitrites zero
Nitrates, 9.0.
Phosphates .06.
Calcium 519 (attempting to lower slowly)
Alkalinity, 10.5.
pH 8.0
Temp 78.4
Salinity 32 (just got new salinity monitor, not sure what is wrong with calibration on refractometer) raising slowly with hypertonic saline in the ATO at 44PPT over 10 gallon)
Salinity is not changing more than .2 or three daily.
No par monitor, but was doing well at current position for several weeks, high flow
Feeding three times a week

Mainly suspicious of one of the tank inhabitants as it happened suddenly overnight
Note the emerald crab in the top of the picture, seen them crawling over the corals at night but I’m not sure if they can cause the tissue to turn white.

 

[Dburr1014]

As of two days ago:

Ammonia, zero
Nitrites zero
Nitrates, 9.0.
Phosphates .06.
Calcium 519 (attempting to lower slowly)
Alkalinity, 10.5.
pH 8.0
Temp 78.4
Salinity 32 (just got new salinity monitor, not sure what is wrong with calibration on refractometer) raising slowly with hypertonic saline in the ATO at 44PPT over 10 gallon)
Salinity is not changing more than .2 or three daily.
No par monitor, but was doing well at current position for several weeks, high flow
Feeding three times a week

Mainly suspicious of one of the tank inhabitants as it happened suddenly overnight
Note the emerald crab in the top of the picture, seen them crawling over the corals at night but I’m not sure if they can cause the tissue to turn white.

The emerald is doing its job, clean up dead tissue.

I suspect salanity. 32 is getting low.
Let's see what others think...

 

[dadnjesse]

If your salinity at 32 is correct and the Calcium and Alkalinity is high it's going to jump higher if you correct it to 35. I would make sure before adding anything.