We have the same problem with getting bored/frustrated with it when agitating, but at that point we switch off who's holding the snake and who's doing the tank. We keep it up until we don't get any more visible dust and then let it sit and settle then do just a little more. We keep a ceiling fan or small room fan either right above the tank or in the tank (did I mention it's a small room fan? lol it's one of the short, thin, cylindrical ones) and turn it on low and that alone circulates a lot of dust out.