hi,please could someone give me some advice had my aquarium running for about 2 months now have had afew problems and been having the water tested regularly. a week ago the the water was still alittle high in a amonia so have been puttig amonia lock in and the fish have been fine and the water is very clear until yesterday the water has become very cloudy so does anyone now what could have caused this and what i could do about it please thanks zoe