Chiller question for calgarian

[Aquattro]

While I don't live in Calgary, chiller use is the same most places. If you run T5 lighting, and the tank is in your basement, you probably don't need one. If, on the other hand, you run metal halides and your tank is on a top floor in a room that gets sun all day, then you probably will need some type of cooling. It comes down to what each tank requires, so monitor it over the next little while, if it's getting close to max temp during this time of year, start saving for a chiller.