When should the Vega's fan turn on? The Vega’s fans are controlled based on temperature and only to turn on if needed. Related articles How to: Reduce AI Light Fan Noise AI-Fi Light Fan FAQs I want to show off my Vega to my friends, is there a demonstration mode? How do I know if my Vega is communicating with my controller? Does the Vega use the same tank guidelines as the Sol?