Appreciate it.
Tank is 4-5 years old
Salinity 34.6, but I'm skeptical of the Hanna salinity meter. Either way, that's the consistent reading.
Waterbox reef salt mix
RODI water
Ph 8.1
Alk 7.9
Ca 490
Nitrate 5.3
Phosphate 0.6 (this had dropped to zero last week, but I don't think this is the problem. I would think more of the other corals would show the issue before this one).
I don't have recent mag testing
Lighting is ap700 with (2) t5 supplement. I don't have par readings.
Tank is mixed reef with one bta, with most (not all) of the sps added 4 weeks ago (10 sps frags added 4 weeks ago, all but 2 are going well). The lobo has been in there about 8 months and is pretty much in it's own corner of the tank.
Fish include maroon clown, hippo, yellow tang, and foxface. They've all been in there for years.
Inverts include a lot of bumblebee snails (to combat vermetids), few hermits, Nassarius. I'm probably missing some.