Does look like it's on it's way out, but then again anemones like doing that "I'm going to die soon. . . . . . NOT!" But as soon as it detaches, I'd take it out of the tank.
IME, 1.023sg is perfectly fine. I run my reef at 1.023 as it's one of the recommendations of the head guy at Fauna Marin (the name escapes me now). One of the reasons (aside from those associated withe Balling method) was that salinity refractometers are made to measure NaCl content - the refraction index of MgCl, CaCl2, and other salts is slightly different and so not accounted by a refractometer, but also make up the salinity of water. So their logic was to run it at a measured 1.023 since it's probably actually running slightly higher. Made sense to me, so I run my tank at 1.023 - 1.024.
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