I have a cichild tank with an argonite based substrate (sand). My tank continually gets cloudy. After each water change it is typically crystal clear for less than a week. I use a good bit of Seachem's Clarity (only because I hate the murky look and cannot do water changes weekly). Initially I had Marineland's 350 Power Filter. After recommendations, I purchased Marineland's 350 Canister filter thinking it may fix the problem. No changes or improvements have occurred. On a sidenote for anyone who has the 350 Canister, that "water polishing additive" does absolutely nothing for my tank. My question is, if I take the current substrate out and switch it with crushed coral will the murky problem improve or be fixed?