I have a 28 gallon euro aquarium with marineland stealth pro 150w heater, penguin 150 bio filter, sand substrate, 4 big black stones, glass canopy and 17w strip light.*3 albino cory catfish 1 female betta. Ok so I unplugged my heater filter and light to do a 50 percent water change. I took 50 percent water out. The temp is down from 80 to 76. I use hose water which contains heavy metals, chlorine and chlorame stuff toxic to fish. I don't have a bucket or anything to fill up with water and add conditioner I have to put the hose in my tank and fill it up then add conditioner. It take me about an hour to fill the tank up so can my fish take 1 hour exposed to untreated tap water with heavy metals, chitons, and chlorame? And also I'm cycling so how long can beneficial bacteria be exposed to the toxic substances listed above? And it's not possible for me to use any bucket or any container. What should I do my temp is dropping and I don't know what to do should o just take the fish out and put them in a cup of treated cold water? Or scoop out some tank water put it in 4 cups and put 1 fish in each cup? I'm panicking lol this is my first water change with fish lol! What do I do?