No not close up but my camera isn’t taking the best pics so I tried either out of water. But reshot them in tank. All my parameters are normal.
Something is out of wack for sure. A healthy coral should not die in 3 days without there being an issue. A likely cause may be that one of your methods of testing is not calibrated properly ie. hypo salinity, temperature too high or low, etc.
You can also look into an ICP test to check for toxic metals, nutrient imbalance, etc, but those things would be less likely to kill a coral so quickly.
You don't have a powerhead blasting them directly, right?