After cleaning a sponge filter (using water from same aquarium ) after a few days the water was slightly hazy/cloudy. wonder if cleaning the sponge filter triggered anything? The aquarium is well established and been running for over a year.
I did an ammonia water test and it came back between 0 and 0.5 ppm
so I did a partial water change.
After 24 hours the aquarium was still the same so did water test again
Nitrate between 0 to 5ppm
so why is my water cloudy?