I use a Fluval 305 canister filter on my QT. It is filled with Matrix. I also dose heavily with nitrifying bacteria: depending on what medication I'm running.
Your QT can be set up using tap water.
I now QT for four to five weeks, and treat do prophylactic treatments of Paraguard and PraziPro.
Don't put any inverts in your fish QT. Some of the medications you may use could effect them. I have a second QT for inverts, corals, and anything else "wet."
Depending on the size of the fish, 27 gallons should be fine short term. Look at the sizes of the tanks fish are temporarily homed in at LFSs.
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Shelley
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