My purple tang recently had ich and I’m currently still treating my main tank with kick-ich pro. I did a water change and a lot of my fish died! I’m left with my tang and a clownfish. My butterfly fish seemed like he had burnt skin, my other clownfish randomly died and my cleaner wrasse just passed after hard breathing for like 1 hour. I don’t know what’s wrong, temperature is at 76, light is on for 8 hours, it’s a 75g and I don’t know what’s happening.