Your last calcium also looks a little low.
I'll test when I get home tonight but everything else looks great aside from a cabbage leather.Recheck phosphates. If high, get chemipure elite as it handles a quick response to lower phos. Once phos is under control, re-dip and pray. Phos should be .005-0.1. That looks like a meat coral. In any case those fleshy corals do poorly in high phos. Run skimmer. Chemipure corrected my phos from 2.5 down to 0.08 in 3 days and my torches look much better. My meat coral also approved.
Yeah, I'll see about dosing some Nitrate. That could be why my wall hammer isn't as big as it has been.Nitrate should not be 0, especially with a phos. of 0.25.
Generally speaking, with a phos of 0.25, you should be running NO3 somewhere around 2.5
If you've been staying stable at 0 nitrate and not doing anything to try to actively boost it, the coral may be starving for nutrients.
While I don't by any means know that this is the answer, it's certainly a possibility, or at least confounding factor.