"wolfdogg" wrote in message ...
i call it the stress free method,

you siphon your tank into your water change container that has fresh
mixed salt water, and simultaneously you take second siphon hose and
siphon the water change container into the sump(assuming the sumps on
the bottom), you need to adjust the hoses with a Kink, or Knot in
them, or simply raise or lower the water change container until the
flow reaches an equilibrium. Then the sump receives water at the same
rate as the tank loses it. its the way i learned from Marc. this way
your tank water level doesn't drop at all, and anything sucked up
will end up in the bucket consequentially.
this way is better than siphoning out water, having your Weir stop or
your water level drop, then pouring water back in which slightly
stresses the creatures, then having to restart the flow again.
some setups wont have the weir (u tube) problem, others will, but
overall its a stress free way to do a water change.

I call it wasteful method :-)
Anybody having anything to do with chemistry will tell you,
that you are wasting a lot of your fresh sal****er - you mix it with
dirty water so effectively you are replacing less water than
the full bucket in the traditional method using two buckets:
one for collecting dirty water and one full with fresh saltmix....

I cannot see how this method lower any stress...
Here is why:

If you have a problems with overflow/weir than you HAVE TO FIX
them immediatelly or the next temporary power outage will cause
your weir to stop and after restarting power your circulation pump
will dump all the content of the sump on your living room floor...
My overflow/weir/sump system is designed that it can take ANY
power outage in any moment and the smp will never run dry
and never overflow... It can be done and should be done :-)
If I knew that my overflow will pour water over my floor with the next
power outage I am not home I would be very stressed man :-)

Second - corals will not suffer temporary exposure to air...
It happens on the reef crest every day with the tidal action...
If you are worried that some coraline exposed to air will
white out you can get it wet during the water change with
a small plastic cup... But for the most cases it is unnecesairy.