i would highly not reccomend using chemical water clerifiers!!!! i once had the same exact problem as you with water clerity and after trying everything i could think of and having non of it work i used a water clearifier, ill never do that again! on the bottle it said it may turn the water purple for a short amount of time but mine stayed that way for 3 days!! it didnt do anything but turn my wtaer purple! so i ended up do a probly 85% water change to get the color out(i know it was bad but i had no choice) it work great and now my wtaer is crystal clear so i would reccommend just doing a rather large water change.