I recently setup a 90 gal tank but found out I was 30 gal short on my sump so I havent started running it yet. with the weather being the waay it was yesterday I couldnt make it out to buy the reef crystal salt I plan on using in this tank so with that being said last night I turned on the lights and the 90 gallons in the tank itself is still cloudy and the sand that has settled looks like theres an 1/8 of an inch of "dust" There isnt any thing in there besides sand and water that was successfully housing 2 fish and an eel 3 days ago.