I've had my hydra 52 set up since Friday afternoon. I start at 8 am and ramp for 4 hours. Peak from 12:00 to 5:00. And ramp back down 4 hours until 9:00. Then it's lights off. Highest intensity is 60% blues and 30% on all other colors. I've noticed my fan hasn't come on. When does the fan normally come on ? Thanks.