If it is a good red bulb (ie not cheap red coated party bulbs) you are fine leaving it on and yep they are nocturnal.

As you are going with glass I assume you have a screen lid - are you covering that with anything to preserve heat and humidity? I know ehen i was using heat lamp with glass tank I had to cover the lid with contac paper or all the humidity got burnt right out and the heat vented out too well also.