Unless you keep your tank in a well ventilated area, or under air-con conditions, you will need some form of additional cooling, in which, getting a fan for an IQ3 makes most sense. Some fans are really weak though, so do ask the staff to give it a demo before deciding. Do take note of the rate of evaporation, and top up fresh water accordingly.
IME, the stock lighting is sufficient for simple mushrooms and yumas. Zoas will require more light.