|I set up a freshwater aquarium tank set up 2 weeks ago and now the water is very hazy. I cleaned out the filter but the water is still hazy. I changed the water and it was clear for a day but now it is hazy again. Why doesn't my filter work?
Your tank is only 2 weeks old and suffers from "New Tank Syndrome" the haze you see is actually the reaction of the water to the Ammonia that the fish are giving off. Fish produce Ammonia as part of their metabolism. You cannot filter this out of the water. In time, Bacteria will spontaneously appear in the tank and they will consume the Ammonia as fast as the fish produce it. This Process is called "Cycling" and takes between 3 to 6 weeks. Anything you do such as water changes, etc., will only delay the process. So be patient wait it out. Remember not to add any fish the tank until the water clears and the water tests negative for ammonia.