Let's hear it for baking soda!
Things are looking better. Alk = 12 dKH; Calcium = 370; pH = 8.4. Birdsnest "bubbles" seem to be receding, definitely not growing. I think they might be hardening, but it's hard to judge by looking - apparently someone else with this problem saw their bubbles calcify and become part of the coral skeleton.
Maybe some new pics later...
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Alan
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