I've found that if the water is cloudy, that could mean one of several things:
- it is the dust from the rocks (if you're using new rocks). If so, wash the rocks out again and the water might clear up
- for some reason, I've found that cloudy water happens more often when using warm or hot water. The colder the water is, the less cloudy it is. I'm not entirely sure why, but I would guess it might have something to do with the heat making particles in the water move more often/faster making the water more cloudy, while cold temperature generally slows particles down
- there could be mineral deposits or other things in the water if you're using tap water. You could let the filter run for a while to clear everything out
Good luck!