Open brain on a hunger strike

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3 days ago I received an open brain, Trachyphyllia radiata.

It is in a mixed LPS/softie tank.

All the other LPS (bubble, octobubble, torch, frogspawn, sun coral etc) get fed mysis every few days and they are doing great.

This open brain will not eat. When I put mysis on it the mysis does not stick to the coral and then when I turn the circulation pump on 10 minutes later the mysis blows off the coral.

All my water numbers are fine except lately the pH is up a ways (8.7) since the addition of my kalkreactor, none of the other corals or fish seem to mind this.

Hypotheses for the brain's behaviour include:

1. Shock/adjustment to shipping, cold exposure during shipping. I did my standard 1 hour acclimation for this coral.

2. Light shock -- he is on the sandbed 24" below a bank of T5 lights, could this be too much for him?

3. pH problems -- but then why are all the other corals fine.

Any suggestions or input would be appreciated, I am not used to an LPS that does not want to eat.