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I usually do 50% plus weekly water changes for my 90G african tank. Three weeks ago when I did a water change, my fish were gasping for air little bit but nothing serious. I found one dead tropheus next day. A week later, I did another water change and a few hours later everybody was gasping for air and next day, I found my large male red empress and another tropheus dead. Fish still gasping for air. I put an air stone in the water and they seemed to be doing much better. Had to leave for one week vacation that day. Came back and things looked Ok. No casuaties. I did smaller water changes on Saturday and yesterday and things are OK. But my fish don't seem as lively as they did three weeks ago and a few fish are not eating. Just wondering if other are experiencing water issues due to recent heat spell. Not quite sure what's going on.... My other tanks are fine.