Hello, newbie here
I got my very first BP (female, 18") last Friday.
I made the mistake of not doing research before getting the snake and made some mistakes. Now that I got a book and found this site I am determined to get things right. So..I need some of help.

First, my setup:

20 Gallon Long Glass Terrarium
Substrate: Aspen
Zoomed Heat Pad (10-20 gallon rating) - placed on left end
75w Red Bulb - placed over right end
Large Water Dish - placed in center of tank
Hides: 2 - one on each end
Dual Digital Therometer\Hygrometer by Exo Terra

1. I am getting a temp reading of about 78-79 in the evening...it was warmer at around 84 a few hours ago in the afternoon. Humidity at 48%-50%. Should I try to increase these numbers? to what and how?

2. Do I run both the light and the heat pad 24/7?

3. The water dish takes a lot of space - can i get away with a smaller one? I keep seeing these small water dishes in videos - mine is huge.

4. Is the 75w bulb positioned correctly - do i need to change it?

Thank you for all the help. Here's a photo too: