Hi--Just set up a ten gallon tank. No fish in it as of yet. Has been running since Friday. Today I got the LED light on the filter to change the filter, pulled it out and it was incredibly dirty. The water is very cloudy, even though we put conditioner in it (came with the aquarium). I changed out the filter and it's running, but still cloudy. I'm not sure what to do, and my local store isn't a lot of help. Any ideas or thoughts? I read the water can go cloudy as the tank cycles, but four days seems like a very short period to have to replace a filter.