Changing the water is to get rid of whatever toxic stuff that is in the tank. If the tank is established it shouldn't go through a cycle again. The bacterial is on the surface of things like glass, filters, gravels, rocks......
They are not free swimming. Keeping the PH and WATER TEMP the same is the key to big waterchanges.
I change 50 - 100% of water everyday and my hundreds of discus are all still alive and swimming happily.
Stripping the tank will definately get rid of all the available bacterial and start the cycle again.
ron