What is the name of the bacteria product you used? Only bio spira contains the true bacteria found in a cycled tank. There are many products out there that accelerate the growth of bacteria and can speed up the cycling process, but the tank still has to cycle.
If your tank is still cycling and you do a massive water change, you will affect the cycle and could slow it down a bit. However, if your ammonia or nitrites are high, the water change is necessary for the health of your fish. Please post your ammonia,
nitrite, and
nitrate levels. If you do a massive water change just to get rid of some of the haziness and your tank is still cycling, it will just return to being hazy within hours anyway. Unless your ammonia and nitrite levels are high, the water change won't do much to improve the look of your tank right now.