Controller auxiliary cable fell into tank, leached copper into reef

AMC20 · Jul 14, 2016

Hey everyone, I'm having a bit of an emergency! So I unplugged my kessil lighting system and the cable must have made its way into the water. It was in there for approximately five hours, with the cable itself becoming extremely corroded during that time frame. My corals all went into shock, along with my anemone and cleanup crew. The snails are dead, and the crabs are in a comatose state only moving when I touch them (was going to remove them). What's my best course of action for fixing this asap? I can't for the life of me get ahold of someone with a copper test kit, so I'll have to wait for Amazon to deliver one tomorrow. I did a 20% water change as soon as I caught it last night, and I'm prepared for an additional 60% today, along with an enormous amount of carbon. As of now the only guaranteed fatality are my waving xenia. Any suggestions please?!