Pocillopora turned bright white , question about change in chemistry

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JAWSIII

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Hi. All. I had Pocillopora that I bought from a friend a few weeks ago. It was doing ok for a while and now it is completely bleached white in just 2 days. To be fair I did make some adjustments mainly to magnesium a few days ago and I’m thinking that’s what did it. Let me explain... 2 weeks ago my parameters were

Ph 8.2
Calcium 400
KH 11.2
Salinity 1.026
Mag 1077
Amonia 0
Nitrite 0
Nitrate 10

I felt that the Mag was a little low so I purchased the 2 part BRS powders to make the Mag adj solution. I used the BRS calculator to make the adjustment I was shooting for 1400. I used the Salifert test kit to measure and I followed the calc to achieve the results. 2 days ago. And woke up this morning to the coral completely white. I tested my tank using Saliferts kits and these are the params this morning

Ph 8.0
Calcium 450
KH 11.5
Salinity 1.026
Mag 1500
Amonia 0
Nitrite 0
Nitrate 10

does anyone think that changes in the Mag and calcium that much in 2 days would have caused this. My lighting has not changed ( I use 2 AI primes running an AB+ BRS schedule) and my temps are set by inkbird controller at 80 degrees

i have 2 photos of the Pocillopora one is taken last week and one taken this morning

17911A2F-32A6-41C7-AEFB-6357886B97F5.jpeg B7530712-2F08-4771-9F45-6C07DAA0FDE7.jpeg
 
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Pistondog

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Was the pocky exposed to the sudden Chem change?
If so, magnesium change is probably the reason for the bleaching.
Let it ride and see if he recovers.
The alk seems a bit high also.
 
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JAWSIII

JAWSIII

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PS. I have other corals that have been in the same tank and went they the same changes and seem to be ok. These pics were taken today also
 

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Terry Le

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This does not have anything to do with your question but do you know Pocillopora can be very invasive. They will pop up everywhere. I had removed my last colony 7 years ago and still have them pop up
 
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