You have my sympathies, Kelly, for sure. I had a similar problem last summer with my alk doser plugging at the sump end. Because I was away a lot then, didn't have time to closely monitor everything, and by the time I discovered the problem the damage was done. Doesn't sound as bad as yours though, as my alk just went below 6 (normally at 8 or 9). But I still lost some prized SPS.
Surprisingly, some corals (incl some SPS) were not affected at all. However, it took about 3 months to recover from that before my SPS was happy again, with good color and growth returning. And I should have known better, too, as I have to regularly watch that alk return line so it doesn't plug.
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