Hello everyone. Bad news. I did my first water change on my 1 month old 55 gallon today and i think i did something wrong. I made sure to test all the levels and they are perfect. I added salt and made sure the temp was right as well. I took out all the decorations and gravel vacd and filled the tank back up. I only took out about half the water. And within one hour one of my fish died The others arnt looking so great. Very stressed, gasping for air, laying at the bottom on their sides, and their colors are all so dark. What did I do. I know these are just fish but my fish are my life, I love them. And i have had all my cichlids for a year and had them in a 20 gallon, I just purchased this 55 gallon a month ago, and was trying to do the right thing and make sure I start water changes and stay on top of it. I was just trying to do the right thing and I killed one of my fish... When I changed the water I only removed 3/4 of it. What did I do wrong?