Is there a thread on setting up QT tanks? If not, what are the basics? And what is the minimum size requirements for one?
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Is it something that I will constantly need to have running or can I bring it out when I need it?Minimum size depends a lot on the species of fish you are quarantining. I've done 2 smallish wrasses in a 10 gallon for their entire QT in the past but now I use a 20 long for my 14 days they spend in copper and two cycled 29 gallon tanks for subsequent observation and treatment for parasites/worms.
I use HOB filters made for 70 gallon tanks on all my QT tanks filled with ceramic media that come from my DT's sump after 3-4 months in there. I keep my QT's set up all the time but you could keep media in your sump for use anytime you need it. Just remember not to put it back in the sump after using it.
You also need a heater and depending on your HOB filter and tank size, maybe a small power head for flow. I put some PVC fittings (T's and els ) for hiding places and that's about all you need. It can be very simple.

