[bertoni]

Did you mean nitrite is at 1 ppm, or is that nitrate? The calcium level should be fine for the animals, at least for quite a while. I suspect that the alkalinity shift would be the cause of any problems you're having, if it came down to the parameters.

The only way to lower the calcium level actively would be water changes with a lower-calcium salt product. Have you measured some freshly-mixed saltwater? Some people get unlucky with their batch of salt, and sometimes salt products settle badly during shipment.

As long as the corals aren't opening, I'd continue with the water changes. A few 15-20% changes might help. Some fresh carbon can help mop up organics and trace metals bound to organics.