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The tank is brand new from crystal dynamics. They delivered it. I didn’t wash the tank but I did fill it up for a leak test and drained it.
If you didn't wash the tank there is no telling what they might have cleaned it with to remove silicone, hand prints, and anything else that could have gotten in it. Just a leak test wouldn't wash this stuff off especially if it was some sort of petroleum based product to remove stuck on silicone. Honestly to lose corals like you describe, sounds more like something detrimental to the actual zooxanthella or corrosive to the flesh of the coral. If they used a molded overflow there could have been mold release still on the plastic or any PVC, etc used.