So, I'm an idiot. I fed my fish after making dinner last night and even though I thoroughly washed my hands, apparently I still had pepper oil on my fingers for chopping up an anaheim pepper. Shortly after I fed them, my bubble tip anemone completely receded into the rock into a quarter sized lump from it's normal 4-5" across. It's the only thing I can figure out that was different - my other parameters were stable - 9.0 alk, 8.4 ph, 370 calcium, 1400 mag. Low or zero amonia, no2 and no3.
Good news though, by noon today it looks like the picture below....

Good news though, by noon today it looks like the picture below....

