Oh no! I did a 50-60% water change on one of my 13g and forgot to add water conditione/dechlorinator! I was tipped off by my pictus catfish heavy breathing and odd behavior. I added a 2-3x dose but is it too late? It was about 4 hours ago that I did the water change. Should I move fish to the 75g? How long does the beneficial bacteria last in tap water that hasn’t been conditioned? I’m not sure how much chlorine or chloramine is in the water in this area, central valley California. Not sure what to do. The fish are breathing heavily/rapidly and lying on substrate floor (usually they are in their hides).