SPS help

[Gordoe]

Looking for some suggestions to help my corals.
My SPS corals are dieing off slowly, one by one. Parameters are all ok. Fish inverts and softies all growing well..

The corals start to go white in one little section and eventually spread over whole coral. Is this a critter in my tank, or bacterial infection?

I'm ready to pull them and put them into a new tank, but I don't want to infect??

Calcium is hovering at 300-400ppm. If this is possible the reason, how quickly can I bring it up to 450ppm?

TIA

[Mitchell]

Can you give us some details on lighting or possibly any changes you have made.
Have you done a search on coral bleaching?



"If this is possible the reason, how quickly can I bring it up to 450ppm? "

I was just reading this evening about bringing up your calcium levels quickly but the book is at work. If you can wait another day I'll get the info for you.

What method do you use to maintain calcium?