I have had cloudy for over a week from adding sand to a new aquarium. Then I added a filter and after about 3 days, it has gotten a little better but still extremely cloudy. I added a single silver dollar and can't even see it. I added a full dose of water clarifier and hope that will work. I used Aqueon water clarifier. Can I use too much? I think there is a lot of sand in the water column so it might need a lot more than I put in. I used about 40 ml in a 75 gallon tank.