I have a 40 gallon I am using for a QT. It has an Aquaclear HOB filter. I use 2 airstones in it for aeration. I use a mesh top, and honestly have never had the tank get over 82 in my house. I do have a small heater in it as well.
I keep an ammonia badge in it, and do frequent, medicated water changes. All fish go through 30 days coppersafe and 2 doses of prazipro.
I have not been QTing corals, although I am wondering if that might not be a good idea.
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