Cloudy Water

[Gulf Live Rock]

the sand and rock should clear that up.

 

[Michael Hughes]

You could also add a flocculant like food grade calcium carbonate powder (the kind used for brewing). Something like 1 tbsp dissolved in 50 mL of water and then you can add a portion of that to the tank. As long as you have fine enough mechanical filtration this should clear up any dust or debris floating around in the tank.