Coral bleaching from underneath

Just got back from weekend in Sacramento to a weird thing... some sps bleached in the weekend.. and one of them is bleaching from u underneath..

Salt is a little high, but everything else seams to be normal... any ideas?



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Not Getting light underneath?

 

Don't think so, it's in my frag biocube, and the led has a good spread on it.. many sps bleached and this one is half way.. testing water now, was talking to @deathbysnusnu and he made a good point.. my tank was very low on the water legal, maybe the alk is too high, the salinity was pretty high.. so I will be testing for it now..

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Ok.. some results:
Ph about 8.8!!
Nitrite .6ish
Alk 9
Salinity 1.028

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Dang that ph... how did you get it that high? Plugged an oxygen tank?


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Are there nutrients in your tank? Shouldn't nitrite be zero?

 

Looks like STN. If it was mine I'd cut the dead tissue parts off and then dip it.

 

is that bacterial or viral infection?

 

I don't know lol... it was fine friday.. Just got home and chaos was in place!!

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Yes.. Just did a water change and will test tomorrow again.

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Got it.. will do it asap

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What are you feeding

 

No one knows for sure. Most believe it's a bacterial infection which is why a few things can be observed. 1) Removing the dead parts sometimes stops it. 2) Dipping can in some cases help, and 3) some people have observed if left untreated it can move to other SPS.

However, no one knows for sure as a lot of factors are in play.

 

Mysis and pellets (alternating the days, not together)...

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