Susitna-flower is correct. You might be going through a mini-cycle since you changed your gravel out. Most of the bacteria is found in the gravel and you rinsing the gravel probably killed a lot of that bacteria, meaning there isnt enough bacteria to eat the full amount of
ammonia in your tank.
Daily water changes of 20-25% and keep testing your parameters. If all parameters are reading good, then one or two water changes a week are all you need and the cloudiness will go away on its own.
Whatever you do, dont add algae remover to your water, it will kill all of your fish.