Water changes won't help much towards clearing the cloudiness in the water. The bacteria responsible for the cloudiness can double every 15 minutes, so just to stop it getting worse would require a 50% water change every 15 minutes.
However, a side effect of a bacterial bloom can be an ammonia spike, which can be deadly for fish. Do you have an ammonia test kit? If there is ammonia present in your water, you should start doing large water changes right away.
Blooms will usually disperse without any action being required, but ammonia needs to be dealt with immediately. The cause of a bacterial bloom is usually dead organic matter being left in the tank (dead fish, plant leaves, fish poo). The best way to treat the bloom, should you wish to do so, is to remove this waste from the tank.
No waste = No bloom
Making sure this waste is not allowed to build up is the key to preventing future blooms too. Gravel vac thoroughly on a regular basis, and everything should be fine going forward.
The most important thing just now though is to establish whether your tank contains any detectable ammonia?
Hope that helps you out.
BTT