What is "tap water cleaner" you mention?
Water changes are a good idea. But use regular tap water with a dechlorinator like Prime, and make sure to match the temperature as you change water.
I hope your fish are okay. It never feels good to have to move fish around.
joy to the fishes in the deep blue sea
55, 30, 30, 20, 10, and 10-gal. freshwater tropical tanks