Acropora bleached/STN overnight, smells very bad, advice on if it can be saved

[nelliereef]

Hello, I got this Acro a couple weeks ago and until this morning it was looking okay. This morning however it looks like it has lost half its tissue and when I took it out to frag the bit that still has tissue left, it smelt like nothing I have ever smelt before. It was awful!

I had an alk swing around the time I put the acro in due to Hanna test kit being wrong and me not cross checking it with another test kit (lesson learned the hard way). Could it be the alk swing that caused this?

The rest of my parameters have been stable for a while.
Alk 8.6 (swung to 10 over a week due to overdosing, reduced back to 8.6 over a week)
Cal 420 - stable
Mag 1300 - stable
Nit 8 - stable
Phos 0.15 - a little unstable, was 0.08 a few weeks ago
Salinity 1.025 - stable

So I'm wondering if the frag can be saved, should I dip it? Was it likely the alk swing that caused this? Could it be too much light?

I have other acro/SPS that are doing just fine. The other acro has some minor tip bleaching but seems to be pulling through.

Photos in order: acro when first put in tank, this morning STN, the frag I cut off

Thanks

 

[Dburr1014]

I don't believe an alk swing of 1.4 would do this.
Do you know the alk where you got it?

I like to keep all at 8-8.5
I'm embarrassed to show you this but here is a screen shot of my tank alk.
The tank pic was a few days ago.

 

[Dburr1014]

How old is your system and how was it started?

 

[Hurricane Aquatics]

That's a Maricultured Acro and definitely not for new Acro Reefers. Don't beat yourself up about it, Maricultured can have issues even if everything is perfect.