Chalice stung by aptasia

[Reefnate]

While I wait for my berghia to do the job, I still deal with aptasia. One of them stung this chalice from the edge and there are now white blotches developing. There is no way I can get this rock out of the tank. Foundational stone. any Thoughts ? you can see the blotches along the bottom edge.

 

[JGT]

Can you get to the aip? Syringe with lemon juice into the center of the oral disk. Boom, no more aip.