Somthing is extremely wrong

Check your sump, if your CA was really that high it would precipitate all over the place. Is your return pump and sump walls covered in a white substance?
 
I've done H2O2 dip on zoas if they have algae or some type of fungus around the polyps. I take the frag out and put it in tank water and add just enought H2O2 so that the algae around the polyps start to bubble and leave it for a couple of minutes. I follow that up a couple of days later with a coralrx dip. I've save a couple of frags this way.
 
If those are truly accurate readings of your parameters, nothing, not a freshwater dip, not a peroxide dip, is going to save your corals. Before you do absolutely anything you need to do a massive water change and stop dosing the Kent essential elements because as stated is almost just a calcium buffer. The reason you are having this problem is because you have been dosing without testing. What is your mag at? I was thinking that the calcium would precipitate too but I think if the mag is out of whack it may allow the calcium levels to be super high.
 
Stop dosing anything and do a water change of 25% ASAP.
Do a 5% water change once a week after that and thats all you will need. Also, I think you need more live rock. Maybe your tank is not stable and parameters change to much.
 

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WHICH PART OF YOUR SETUP IS HARDEST TO REACH OR REMOVE FOR ROUTINE MAINTENANCE?

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