Water change reuse?

Wayne Sallee wrote:
Most people do a 15% water change once a month. I like doing a 50% water
change about once every 3 to 6 months.

I do 6 gallons change in my 55 gallon tank weekly. Because
of all the rocks and corals, it's probably more than 15%.
The RO/DI has to be run weekly anyhow, and some green algae
has to be removed that often and the additives are used
weekly + the coral feeding and the anemone's weekly shrimp
diet, so it just seems convenient. Also, 6 gallons is how
much fits in the pail, so I don't have to measure the level
in the tank. It just seems all around simpler to do all the
weekly stuff at once.

rtk