Good decision to move the heater! There are enclosure light bulbs called "Moonlight" that look black when off and very dim purplish when on. They come in many sizes and wattage and that's what I use in my Pacman enclosure.
Last thing to look at would be feeding. Crickets are not the best food so you might want to supplement that with night crawlers. Source are pet shops and bait-tackle shops (if later ensure they are not dyed). Can also try Dubia roaches too... yummy! Seem like a lot of stuff, but once you get the enclosure set-up right, rest is easy, Good luck!