I went camping for 4 days, I came home to all my Fish dead and all corals bleached. Apparently my Aquarium Engineering Calcium rector co2 valve got stuck open and dumped a 20 pound tank of Co2 into the tank. The tank is 125 gallon. I already did around 50 gallon water change and am making water now. My Hanna tester is flashing 20 dkh still after all the water changes so far. How can I get the Alkalinity back to normal? Can I dump Muratic acid into the tank. My snails, starfish and serpent star are the only things still alive.
