My sinularia which I've had for a few years and is almost a foot across fully expanded seems to have some kind of recession on the stalk. There were some brown spots that easily came off with a light toothbrush scrubbing. When I look at old photos, it's there but much lower down on the stalk. It isn't drooping or closed up (but it is annoyed with the light scrubbing). Alk 8.0. Calc 400, nitrate ~10ppm, Po4 ~.1 (fighting some dinos so it's purposefully elevated) Any ideas? Terrible photo - my reef looks much brighter and warmer.
