I never really thought too much about it when I started doing this, but I have been told by a few people it's a good idea.
I use a syringe that I bought from a pet store to pull water from the tank and fill the test tubes for testing. I don't have to dump and refill several times to get to the line. The syringe makes it very easy and quick to fill the tubes right to the line and I am then ready to add the drops needed.
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