Thank you for the thorough explanation. May I ask why you use the two products differently in the way that you do? If the beach is sufficient for tank changes, then why not for regular maintenance as well? Of course I suspect it's because the bleach is a harsher chemical, although I have never tried the 5% diluted form, but even at that level is there is safety risk for the animals that relegates it to be used only when a tank is being completely emptied?