While this is great (or not so) info on how water is the great dissolver, you have quite exuberantly eluded the question by supplying items irrelevant to a direct question. So I will simply ask again, why do you tell 50% of the people it IS necessary to vacuum the tank and the other 50% NOT to vacuum ? This information that you supplied is in threads "Confusion about ich" where you state "Do a good job about vacuuming the bottom material if possible" and "Water changes" where you state "There's no need to vacuum the bottom". Two highly contradictory statements.
Now to go one step further, just because it's dissolved means absolutely nothing since the undissolved material will greatly contribute to producing an more unstable environment in a much shorter time. So in laymen's terms, if there's no fuel to add to the fire, the fire goes out. If there is fuel, the fire will continue to burn. Right ?
Sent from my iPhone that doesn't like me. Or you !!