I'm fairly new to this. I previously had a thriving saltwater tank for 3 years. This one is fairly new, approximately 6 months now. In the past week 4 of my 7 fish have died after doing a water change. I purchase premixed ro/di from my lfs. I should have done this before but after losing fish so quickly I decided to test their water and found amonia. Then tested salinity and it was over 1.032. The last fish to go was one of my clowns and I noticed both looked like they had a film on them and losing patches of color on their stripes. Lfs gave me ichx to treat for brook in my QT. I just lowered salinity in QT to 1.020 but any advice would be appreciated because I'm not sure if I'm doing the right things or even doing them correctly. I posted a slomo video because it was hard to gwt a good picture with him moving. Side note...female died male moved to QT and I just found clownfish eggs in a rock in my DT!