A word of warning about quarantine tanks...

I actually have multiple quarantine tanks. Here's how it works.

First you get the quarantine tank. Then you set it up and think "the best way to use this tank is to keep it set up all the time". The next decision is that if the tank is going to be setup up all the time, you should keep some fish in it to keep it biologically viable. Next comes the thought that "this would be a great place to keep some low light plant cuttings from my planted tank!".

At the next fish purchase, your quarantine tank is no longer a quarantine tank... so you buy another one.

Then you set it up and think "the best way to use this tank is to keep it set up all the time"...