Hi i got 30 inch tank cabnet i got all my filter heater orniments etc.... etc... setup wen i filled it up its was all white and mercy it was like that for 3 days so i emptyed it and cleaned my gravel AGAIN i have cleaned my gravel 3 times in the tank i filled it up one last time and have left it running for 2 days and it is still FAINTLY mercy but noticeable it just wont settle and go crystal clear i dunno wot to do the gravel i clean keeps running clear please can some one help