Remind me about the “measuring thing” please. Im oldWhen changing the water, do you have to prep the new water beforehand? I've seen different opinions on how much water changing to do....I think that a medium that I've come up with is 10% every other week, and 20% the weeks in between? Does that sound good? Bad? More? Less?
I saw on @Fishychix 's post that they have a measuring thing...is that helpful for doing water changes?
