I've finished my water changes for this week, and it's a good thing. While working through the tanks, I scared out some fry from the biteniatum killies we caught in Benin - a first fry sighting for that location. I realized one of my cryptocorynes had produced 2 new plants I didn't see last week. My Neolebias powelli came out of hiding. My tanks all looked better, and my ammonia tester, my nose, was satisfied with the results.
My Procatopus nototaenia and Epiplatys togolensis young had put on visible growth spurts, and the Hoplisoma atropersonatus got frisky with the fresh water, before I'd even shut off the hose. On a negative note, I realized an HOB had a broken impeller and wasn't working, so I was able to change extra and move new cycled filtration over to that tank. If I had missed that with the summer heat, I could have lost some fish.
Water changes are part of it, and leaving your fish exposed to ammonia definitely shouldn't be.