If you have Manderine's in your tank that bread then you must be doing something right.
I'm going to second the flow thing. Stoney corals will die if they don't have enough water flow to help them shead their slime. If you want to test your tank, the Xenia is a good tester. Give it some time to see if it starts to grow.
One thing I noticed, and it might be a typo, but your Carbonate hardness tested at 90? Also, what is your Magnesium levels at?