I’d probably move it lower. I have two acans one on the sandbed and another about 3 inches above the sandbed on a rock both are in low light low flow in about 50 par. I find that when they were in higher light they start shrinking and loses their colors turning mostly red/orange. My calcium is at 460, alk 8.8 and mag 1450.
I will probably move it under the macro, less light and flow.
I will be switching to AF reef salt next week or so. AF sea salt is too low imo.