My tank has always been cloudy. First I thought it was because of it being new and still cycling. Then I thought it was my filter and after cleaning it and doing a water change it was clear for 2 days then went right back to being cloudy. A month ago I put in black sand but it's not cloudy b/c of that. It's not the bio load either b/c I have other tank that are much more overstocked. What's a good way to always keep my water crystal clear. I know there is a tablet you drop into your tank to make it clear but does that really work? Discuss.