I don't see any signs of tissue necrosis or infection of any sort in the photos. Your corals are healthy. They just aren't opening to feed due to the lack of nutrients in the water. SPS and LPS aren't usually found together in nature due to their varying requirements. In other words, you can't please all of the corals all of the time. If you feed the tank phytoplankton it will promote the growth of microfauna that will in turn feed your corals. Bioavailable nutrients will get your corals to open again. Target feeding will speed things along.
The favia lost some of its zooxanthellae by the looks of it. This doesn't fit with a low nutrient problem. It is however something that is caused by other Zeovit products that bleach corals for better colours. I'm not too familiar with their product line, so I'm not sure which ones nave this effect, but zeovit media is not one of them. What else are you putting in the tank?
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