QT question

extremepcs

Member
I am going to setup a quarantine tank this weekend. The guy at my LFS said to not put any water in it until I need to use it, and to use my main tank water when I do. He said that just leaving it running with nothing in it would be bad.
Those of you with QT, do you leave a fish or something in it all of the time to keep the levels normal?
Thanks!
 
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