I have a new tank with fish in it and the ammonia levels have risen some. The thing hasn't established itself yet in a good balance and the water has a whitish cloudy look to it. What is the best way to maintain the fish tank to help save the fish from a terrible end. Should I be cleaning the gravel on the bottom of the tank? How do I clean the gravel? I am already doing water changes but what percentage is the ideal and at what intervals? Thanks alot.