George Patterson wrote:
KurtG wrote:

btw, it also drive me nuts when the recommendation is to "replace your
evaporated water first" then do a water change. You want to suck out
waste water at it's highest concentrations and then refill will both
salt and fresh water to get you back to your SG.


And I'm the opposite. I mix up my salt water to the correct SG, drain my
tank down to a specific point on the glass (ie. 25 gallons low), and add
the new water to top it back off. If the water level in the tank is low
before the change, I won't actually be draining off 25 gallons, and the
SG will be a bit high after the water change. It could get quite high
after several water changes.

George Patterson
If you torture the data long enough, eventually it will confess
to anything.


Huh?

Don't see what advantage there is to that - what advantage does having a
25G low mark give you?

Do you generally only have 25 Gal available to replace with?

I do it this way-

take water out, THEN adjust SG to norm, THEN refill with new sal****er.

I do many many micro changes (plus I only have a 20 gal nano anyway...)
so I never thought about putting a mark for a specific amount to drain.

I recently started doing 1/4 gallon (ie: 1 qt) change per day, every
day, on schedule at 11:00 pm before I go to bed -- part of my nightime
routine -- comes right after "brush teeth" on the checklist. seems to
work quite well for a small tank - I can do the wtare change in under 30
seconds using a plastic 1 qt measuri8ng cup.